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diff --git a/node_modules/workbox-routing/LICENSE b/node_modules/workbox-routing/LICENSE
new file mode 100644
index 00000000..136b9039
--- /dev/null
+++ b/node_modules/workbox-routing/LICENSE
@@ -0,0 +1,201 @@
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diff --git a/node_modules/workbox-routing/NavigationRoute.mjs b/node_modules/workbox-routing/NavigationRoute.mjs
new file mode 100644
index 00000000..a223f171
--- /dev/null
+++ b/node_modules/workbox-routing/NavigationRoute.mjs
@@ -0,0 +1,121 @@
+/*
+ Copyright 2016 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import {Route} from './Route.mjs';
+import './_version.mjs';
+
+/**
+ * NavigationRoute makes it easy to create a [Route]{@link
+ * workbox.routing.Route} that matches for browser
+ * [navigation requests]{@link https://developers.google.com/web/fundamentals/primers/service-workers/high-performance-loading#first_what_are_navigation_requests}.
+ *
+ * It will only match incoming Requests whose
+ * [`mode`]{@link https://fetch.spec.whatwg.org/#concept-request-mode}
+ * is set to `navigate`.
+ *
+ * You can optionally only apply this route to a subset of navigation requests
+ * by using one or both of the `blacklist` and `whitelist` parameters.
+ *
+ * @memberof workbox.routing
+ * @extends workbox.routing.Route
+ */
+class NavigationRoute extends Route {
+  /**
+   * If both `blacklist` and `whiltelist` are provided, the `blacklist` will
+   * take precedence and the request will not match this route.
+   *
+   * The regular expressions in `whitelist` and `blacklist`
+   * are matched against the concatenated
+   * [`pathname`]{@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLHyperlinkElementUtils/pathname}
+   * and [`search`]{@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLHyperlinkElementUtils/search}
+   * portions of the requested URL.
+   *
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resulting in a Response.
+   * @param {Object} options
+   * @param {Array<RegExp>} [options.blacklist] If any of these patterns match,
+   * the route will not handle the request (even if a whitelist RegExp matches).
+   * @param {Array<RegExp>} [options.whitelist=[/./]] If any of these patterns
+   * match the URL's pathname and search parameter, the route will handle the
+   * request (assuming the blacklist doesn't match).
+   */
+  constructor(handler, {whitelist = [/./], blacklist = []} = {}) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isArrayOfClass(whitelist, RegExp, {
+        moduleName: 'workbox-routing',
+        className: 'NavigationRoute',
+        funcName: 'constructor',
+        paramName: 'options.whitelist',
+      });
+      assert.isArrayOfClass(blacklist, RegExp, {
+        moduleName: 'workbox-routing',
+        className: 'NavigationRoute',
+        funcName: 'constructor',
+        paramName: 'options.blacklist',
+      });
+    }
+
+    super((...args) => this._match(...args), handler);
+
+    this._whitelist = whitelist;
+    this._blacklist = blacklist;
+  }
+
+  /**
+   * Routes match handler.
+   *
+   * @param {Object} options
+   * @param {FetchEvent} options.event
+   * @param {URL} options.url
+   * @return {boolean}
+   *
+   * @private
+   */
+  _match({event, url}) {
+    if (event.request.mode !== 'navigate') {
+      return false;
+    }
+
+    const pathnameAndSearch = url.pathname + url.search;
+
+    if (this._blacklist.some((regExp) => regExp.test(pathnameAndSearch))) {
+      if (process.env.NODE_ENV !== 'production') {
+        logger.debug(`The navigation route is not being used, since the ` +
+          `request URL matches both the whitelist and blacklist.`);
+      }
+      return false;
+    }
+
+    if (this._whitelist.some((regExp) => regExp.test(pathnameAndSearch))) {
+      if (process.env.NODE_ENV !== 'production') {
+        logger.debug(`The navigation route is being used.`);
+      }
+      return true;
+    } else {
+      if (process.env.NODE_ENV !== 'production') {
+        logger.debug(
+          `The navigation route is not being used, since the ` +
+          `URL being navigated to doesn't match the whitelist.`
+        );
+      }
+    }
+
+    return false;
+  }
+}
+
+export {NavigationRoute};
diff --git a/node_modules/workbox-routing/README.md b/node_modules/workbox-routing/README.md
new file mode 100644
index 00000000..0c19ecc1
--- /dev/null
+++ b/node_modules/workbox-routing/README.md
@@ -0,0 +1 @@
+This module's documentation can be found at https://developers.google.com/web/tools/workbox/modules/workbox-routing
diff --git a/node_modules/workbox-routing/RegExpRoute.mjs b/node_modules/workbox-routing/RegExpRoute.mjs
new file mode 100644
index 00000000..7d217d31
--- /dev/null
+++ b/node_modules/workbox-routing/RegExpRoute.mjs
@@ -0,0 +1,93 @@
+/*
+ Copyright 2017 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import {Route} from './Route.mjs';
+import './_version.mjs';
+
+/**
+ * RegExpRoute makes it easy to create a regular expression based
+ * [Route]{@link workbox.routing.Route}.
+ *
+ * For same-origin requests the RegExp only needs to match part of the URL. For
+ * requests against third-party servers, you must define a RegExp that matches
+ * the start of the URL.
+ *
+ * [See the module docs for info.]{@link https://developers.google.com/web/tools/workbox/modules/workbox-routing}
+ *
+ * @memberof workbox.routing
+ * @extends workbox.routing.Route
+ */
+class RegExpRoute extends Route {
+  /**
+   * If the regulard expression contains
+   * [capture groups]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#grouping-back-references},
+   * th ecaptured values will be passed to the
+   * [handler's]{@link workbox.routing.Route~handlerCallback} `params`
+   * argument.
+   *
+   * @param {RegExp} regExp The regular expression to match against URLs.
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resulting in a Response.
+   * @param {string} [method='GET'] The HTTP method to match the Route
+   * against.
+   */
+  constructor(regExp, handler, method) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isInstance(regExp, RegExp, {
+        moduleName: 'workbox-routing',
+        className: 'RegExpRoute',
+        funcName: 'constructor',
+        paramName: 'pattern',
+      });
+    }
+
+    const match = ({url}) => {
+      const result = regExp.exec(url.href);
+
+      // Return null immediately if there's no match.
+      if (!result) {
+        return null;
+      }
+
+      // Require that the match start at the first character in the URL string
+      // if it's a cross-origin request.
+      // See https://github.com/GoogleChrome/workbox/issues/281 for the context
+      // behind this behavior.
+      if ((url.origin !== location.origin) && (result.index !== 0)) {
+        if (process.env.NODE_ENV !== 'production') {
+          logger.debug(
+            `The regular expression '${regExp}' only partially matched ` +
+            `against the cross-origin URL '${url}'. RegExpRoute's will only ` +
+            `handle cross-origin requests if they match the entire URL.`
+          );
+        }
+
+        return null;
+      }
+
+      // If the route matches, but there aren't any capture groups defined, then
+      // this will return [], which is truthy and therefore sufficient to
+      // indicate a match.
+      // If there are capture groups, then it will return their values.
+      return result.slice(1);
+    };
+
+    super(match, handler, method);
+  }
+}
+
+export {RegExpRoute};
diff --git a/node_modules/workbox-routing/Route.mjs b/node_modules/workbox-routing/Route.mjs
new file mode 100644
index 00000000..dba3b43a
--- /dev/null
+++ b/node_modules/workbox-routing/Route.mjs
@@ -0,0 +1,65 @@
+/*
+ Copyright 2017 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+
+import {defaultMethod, validMethods} from './utils/constants.mjs';
+import normalizeHandler from './utils/normalizeHandler.mjs';
+import './_version.mjs';
+
+/**
+ * A `Route` consists of a pair of callback functions, "match" and "handler".
+ * The "match" callback determine if a route should be used to "handle" a
+ * request by returning a non-falsy value if it can. The "handler" callback
+ * is called when there is a match and should return a Promise that resolves
+ * to a `Response`.
+ *
+ * @memberof workbox.routing
+ */
+class Route {
+  /**
+   * Constructor for Route class.
+   *
+   * @param {workbox.routing.Route~matchCallback} match
+   * A callback function that determines whether the route matches a given
+   * `fetch` event by returning a non-falsy value.
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resolving to a Response.
+   * @param {string} [method='GET'] The HTTP method to match the Route
+   * against.
+   */
+  constructor(match, handler, method) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isType(match, 'function', {
+        moduleName: 'workbox-routing',
+        className: 'Route',
+        funcName: 'constructor',
+        paramName: 'match',
+      });
+
+      if (method) {
+        assert.isOneOf(method, validMethods, {paramName: 'method'});
+      }
+    }
+
+    // These values are referenced directly by Router so cannot be
+    // altered by minifification.
+    this.handler = normalizeHandler(handler);
+    this.match = match;
+    this.method = method || defaultMethod;
+  }
+}
+
+export {Route};
diff --git a/node_modules/workbox-routing/Router.mjs b/node_modules/workbox-routing/Router.mjs
new file mode 100644
index 00000000..c2938d24
--- /dev/null
+++ b/node_modules/workbox-routing/Router.mjs
@@ -0,0 +1,313 @@
+/*
+ Copyright 2017 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';
+import {getFriendlyURL} from 'workbox-core/_private/getFriendlyURL.mjs';
+
+import normalizeHandler from './utils/normalizeHandler.mjs';
+import './_version.mjs';
+
+/**
+ * The Router can be used to process a FetchEvent through one or more
+ * [Routes]{@link workbox.routing.Route} responding  with a Request if
+ * a matching route exists.
+ *
+ * If no route matches a given a request, the Router will use a "default"
+ * handler if one is defined.
+ *
+ * Should the matching Route throw an error, the Router will use a "catch"
+ * handler if one is defined to gracefully deal with issues and respond with a
+ * Request.
+ *
+ * If a request matches multiple routes, the **earliest** registered route will
+ * be used to respond to the request.
+ *
+ * @memberof workbox.routing
+ */
+class Router {
+  /**
+   * Initializes a new Router.
+   */
+  constructor() {
+    // _routes will contain a mapping of HTTP method name ('GET', etc.) to an
+    // array of all the corresponding Route instances that are registered.
+    this._routes = new Map();
+  }
+
+  /**
+   * Apply the routing rules to a FetchEvent object to get a Response from an
+   * appropriate Route's handler.
+   *
+   * @param {FetchEvent} event The event from a service worker's 'fetch' event
+   * listener.
+   * @return {Promise<Response>|undefined} A promise is returned if a
+   * registered route can handle the FetchEvent's request. If there is no
+   * matching route and there's no `defaultHandler`, `undefined` is returned.
+   */
+  handleRequest(event) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isInstance(event, FetchEvent, {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'handleRequest',
+        paramName: 'event',
+      });
+    }
+
+    const url = new URL(event.request.url);
+    if (!url.protocol.startsWith('http')) {
+      if (process.env.NODE_ENV !== 'production') {
+        logger.debug(
+          `Workbox Router only supports URLs that start with 'http'.`);
+      }
+      return;
+    }
+
+    let route = null;
+    let handler = null;
+    let params = null;
+    let debugMessages = [];
+
+    const result = this._findHandlerAndParams(event, url);
+    handler = result.handler;
+    params = result.params;
+    route = result.route;
+    if (process.env.NODE_ENV !== 'production') {
+      if (handler) {
+        debugMessages.push([
+          `Found a route to handle this request:`, route,
+        ]);
+
+        if (params) {
+          debugMessages.push([
+            `Passing the following params to the route's handler:`, params,
+          ]);
+        }
+      }
+    }
+
+    // If we don't have a handler because there was no matching route, then
+    // fall back to defaultHandler if that's defined.
+    if (!handler && this._defaultHandler) {
+      if (process.env.NODE_ENV !== 'production') {
+        debugMessages.push(`Failed to find a matching route. Falling ` +
+          `back to the default handler.`);
+
+        // This is used for debugging in logs in the case of an error.
+        route = '[Default Handler]';
+      }
+      handler = this._defaultHandler;
+    }
+
+    if (!handler) {
+      if (process.env.NODE_ENV !== 'production') {
+        // No handler so Workbox will do nothing. If logs is set of debug
+        // i.e. verbose, we should print out this information.
+        logger.debug(`No route found for: ${getFriendlyURL(url)}`);
+      }
+      return;
+    }
+
+    if (process.env.NODE_ENV !== 'production') {
+      // We have a handler, meaning Workbox is going to handle the route.
+      // print the routing details to the console.
+      logger.groupCollapsed(`Router is responding to: ${getFriendlyURL(url)}`);
+      debugMessages.forEach((msg) => {
+        if (Array.isArray(msg)) {
+          logger.log(...msg);
+        } else {
+          logger.log(msg);
+        }
+      });
+
+      // The Request and Response objects contains a great deal of information,
+      // hide it under a group in case developers want to see it.
+      logger.groupCollapsed(`View request details here.`);
+      logger.unprefixed.log(event.request);
+      logger.groupEnd();
+
+      logger.groupEnd();
+    }
+
+    // Wrap in try and catch in case the handle method throws a synchronous
+    // error. It should still callback to the catch handler.
+    let responsePromise;
+    try {
+      responsePromise = handler.handle({url, event, params});
+    } catch (err) {
+      responsePromise = Promise.reject(err);
+    }
+
+    if (responsePromise && this._catchHandler) {
+      responsePromise = responsePromise.catch((err) => {
+        if (process.env.NODE_ENV !== 'production') {
+          // Still include URL here as it will be async from the console group
+          // and may not make sense without the URL
+          logger.groupCollapsed(`Error thrown when responding to: ` +
+            ` ${getFriendlyURL(url)}. Falling back to Catch Handler.`);
+          logger.unprefixed.error(`Error thrown by:`, route);
+          logger.unprefixed.error(err);
+          logger.groupEnd();
+        }
+        return this._catchHandler.handle({url, event, err});
+      });
+    }
+
+    return responsePromise;
+  }
+
+  /**
+   * Checks the incoming `event.request` against the registered routes, and if
+   * there's a match, returns the corresponding handler along with any params
+   * generated by the match.
+   *
+   * @param {FetchEvent} event
+   * @param {URL} url
+   * @return {Object} Returns an object with `handler` and `params` properties.
+   * They are populated if a matching route was found or `undefined` otherwise.
+   *
+   * @private
+   */
+  _findHandlerAndParams(event, url) {
+    const routes = this._routes.get(event.request.method) || [];
+    for (const route of routes) {
+      let matchResult = route.match({url, event});
+      if (matchResult) {
+        if (Array.isArray(matchResult) && matchResult.length === 0) {
+          // Instead of passing an empty array in as params, use undefined.
+          matchResult = undefined;
+        } else if ((matchResult.constructor === Object &&
+          Object.keys(matchResult).length === 0) || matchResult === true) {
+          // Instead of passing an empty object in as params, use undefined.
+          matchResult = undefined;
+        }
+
+        // Break out of the loop and return the appropriate values as soon as
+        // we have a match.
+        return {
+          route,
+          params: matchResult,
+          handler: route.handler,
+        };
+      }
+    }
+
+    // If we didn't have a match, then return undefined values.
+    return {handler: undefined, params: undefined};
+  }
+
+  /**
+   * Define a default `handler` that's called when no routes explicitly
+   * match the incoming request.
+   *
+   * Without a default handler, unmatched requests will go against the
+   * network as if there were no service worker present.
+   *
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resulting in a Response.
+   */
+  setDefaultHandler(handler) {
+    this._defaultHandler = normalizeHandler(handler);
+  }
+
+  /**
+   * If a Route throws an error while handling a request, this `handler`
+   * will be called and given a chance to provide a response.
+   *
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resulting in a Response.
+   */
+  setCatchHandler(handler) {
+    this._catchHandler = normalizeHandler(handler);
+  }
+
+  /**
+   * Registers a route with the router.
+   *
+   * @param {workbox.routing.Route} route The route to register.
+   */
+  registerRoute(route) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isType(route, 'object', {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'registerRoute',
+        paramName: 'route',
+      });
+
+      assert.hasMethod(route, 'match', {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'registerRoute',
+        paramName: 'route',
+      });
+
+      assert.isType(route.handler, 'object', {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'registerRoute',
+        paramName: 'route',
+      });
+
+      assert.hasMethod(route.handler, 'handle', {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'registerRoute',
+        paramName: 'route.handler',
+      });
+
+      assert.isType(route.method, 'string', {
+        moduleName: 'workbox-routing',
+        className: 'Router',
+        funcName: 'registerRoute',
+        paramName: 'route.method',
+      });
+    }
+
+    if (!this._routes.has(route.method)) {
+      this._routes.set(route.method, []);
+    }
+
+    // Give precedence to all of the earlier routes by adding this additional
+    // route to the end of the array.
+    this._routes.get(route.method).push(route);
+  }
+
+  /**
+   * Unregisters a route with the router.
+   *
+   * @param {workbox.routing.Route} route The route to unregister.
+   */
+  unregisterRoute(route) {
+    if (!this._routes.has(route.method)) {
+      throw new WorkboxError(
+        'unregister-route-but-not-found-with-method', {
+          method: route.method,
+        }
+      );
+    }
+
+    const routeIndex = this._routes.get(route.method).indexOf(route);
+    if (routeIndex > -1) {
+      this._routes.get(route.method).splice(routeIndex, 1);
+    } else {
+      throw new WorkboxError('unregister-route-route-not-registered');
+    }
+  }
+}
+
+export {Router};
diff --git a/node_modules/workbox-routing/_default.mjs b/node_modules/workbox-routing/_default.mjs
new file mode 100644
index 00000000..d97baf76
--- /dev/null
+++ b/node_modules/workbox-routing/_default.mjs
@@ -0,0 +1,208 @@
+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import {NavigationRoute} from './NavigationRoute.mjs';
+import {RegExpRoute} from './RegExpRoute.mjs';
+import {Router} from './Router.mjs';
+import {Route} from './Route.mjs';
+import {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';
+import {assert} from 'workbox-core/_private/assert.mjs';
+import {cacheNames} from 'workbox-core/_private/cacheNames.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import './_version.mjs';
+
+if (process.env.NODE_ENV !== 'production') {
+  assert.isSwEnv('workbox-routing');
+}
+
+/**
+ * @private
+ */
+class DefaultRouter extends Router {
+  /**
+   * Easily register a RegExp, string, or function with a caching
+   * strategy to the Router.
+   *
+   * This method will generate a Route for you if needed and
+   * call [Router.registerRoute()]{@link
+   * workbox.routing.Router#registerRoute}.
+   *
+   * @param {
+   * RegExp|
+   * string|
+   * workbox.routing.Route~matchCallback|
+   * workbox.routing.Route
+   * } capture
+   * If the capture param is a `Route`, all other arguments will be ignored.
+   * @param {workbox.routing.Route~handlerCallback} handler A callback
+   * function that returns a Promise resulting in a Response.
+   * @param {string} [method='GET'] The HTTP method to match the Route
+   * against.
+   * @return {workbox.routing.Route} The generated `Route`(Useful for
+   * unregistering).
+   *
+   * @alias workbox.routing.registerRoute
+   */
+  registerRoute(capture, handler, method = 'GET') {
+    let route;
+
+    if (typeof capture === 'string') {
+      const captureUrl = new URL(capture, location);
+
+      if (process.env.NODE_ENV !== 'production') {
+        if (!(capture.startsWith('/') || capture.startsWith('http'))) {
+          throw new WorkboxError('invalid-string', {
+            moduleName: 'workbox-routing',
+            className: 'DefaultRouter',
+            funcName: 'registerRoute',
+            paramName: 'capture',
+          });
+        }
+
+        // We want to check if Express-style wildcards are in the pathname only.
+        // TODO: Remove this log message in v4.
+        const valueToCheck = capture.startsWith('http') ?
+          captureUrl.pathname :
+          capture;
+        // See https://github.com/pillarjs/path-to-regexp#parameters
+        const wildcards = '[*:?+]';
+        if (valueToCheck.match(new RegExp(`${wildcards}`))) {
+          logger.debug(
+            `The '$capture' parameter contains an Express-style wildcard ` +
+            `character (${wildcards}). Strings are now always interpreted as ` +
+            `exact matches; use a RegExp for partial or wildcard matches.`
+          );
+        }
+      }
+
+      const matchCallback = ({url}) => {
+        if (process.env.NODE_ENV !== 'production') {
+          if ((url.pathname === captureUrl.pathname) &&
+              (url.origin !== captureUrl.origin)) {
+            logger.debug(
+              `${capture} only partially matches the cross-origin URL ` +
+              `${url}. This route will only handle cross-origin requests ` +
+              `if they match the entire URL.`
+            );
+          }
+        }
+
+        return url.href === captureUrl.href;
+      };
+
+      route = new Route(matchCallback, handler, method);
+    } else if (capture instanceof RegExp) {
+      route = new RegExpRoute(capture, handler, method);
+    } else if (typeof capture === 'function') {
+      route = new Route(capture, handler, method);
+    } else if (capture instanceof Route) {
+      route = capture;
+    } else {
+      throw new WorkboxError('unsupported-route-type', {
+        moduleName: 'workbox-routing',
+        className: 'DefaultRouter',
+        funcName: 'registerRoute',
+        paramName: 'capture',
+      });
+    }
+
+    super.registerRoute(route);
+    return route;
+  }
+
+  /**
+   * Register a route that will return a precached file for a navigation
+   * request. This is useful for the
+   * [application shell pattern]{@link https://developers.google.com/web/fundamentals/architecture/app-shell}.
+   *
+   * This method will generate a
+   * [NavigationRoute]{@link workbox.routing.NavigationRoute}
+   * and call
+   * [Router.registerRoute()]{@link workbox.routing.Router#registerRoute}
+   * .
+   *
+   * @param {string} cachedAssetUrl
+   * @param {Object} [options]
+   * @param {string} [options.cacheName] Cache name to store and retrieve
+   * requests. Defaults to precache cache name provided by
+   * [workbox-core.cacheNames]{@link workbox.core.cacheNames}.
+   * @param {Array<RegExp>} [options.blacklist=[]] If any of these patterns
+   * match, the route will not handle the request (even if a whitelist entry
+   * matches).
+   * @param {Array<RegExp>} [options.whitelist=[/./]] If any of these patterns
+   * match the URL's pathname and search parameter, the route will handle the
+   * request (assuming the blacklist doesn't match).
+   * @return {workbox.routing.NavigationRoute} Returns the generated
+   * Route.
+   *
+   * @alias workbox.routing.registerNavigationRoute
+   */
+  registerNavigationRoute(cachedAssetUrl, options = {}) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isType(cachedAssetUrl, 'string', {
+        moduleName: 'workbox-routing',
+        className: '[default export]',
+        funcName: 'registerNavigationRoute',
+        paramName: 'cachedAssetUrl',
+      });
+    }
+
+    const cacheName = cacheNames.getPrecacheName(options.cacheName);
+    const handler = () => caches.match(cachedAssetUrl, {cacheName})
+      .then((response) => {
+        if (response) {
+          return response;
+        }
+        // This shouldn't normally happen, but there are edge cases:
+        // https://github.com/GoogleChrome/workbox/issues/1441
+        throw new Error(`The cache ${cacheName} did not have an entry for ` +
+          `${cachedAssetUrl}.`);
+      }).catch((error) => {
+        // If there's either a cache miss, or the caches.match() call threw
+        // an exception, then attempt to fulfill the navigation request with
+        // a response from the network rather than leaving the user with a
+        // failed navigation.
+        if (process.env.NODE_ENV !== 'production') {
+          logger.debug(`Unable to respond to navigation request with cached ` +
+            `response: ${error.message}. Falling back to network.`);
+        }
+
+        // This might still fail if the browser is offline...
+        return fetch(cachedAssetUrl);
+      });
+
+    const route = new NavigationRoute(handler, {
+      whitelist: options.whitelist,
+      blacklist: options.blacklist,
+    });
+    super.registerRoute(route);
+
+    return route;
+  }
+}
+
+const router = new DefaultRouter();
+
+// By default, register a fetch event listener that will respond to a request
+// only if there's a matching route.
+self.addEventListener('fetch', (event) => {
+  const responsePromise = router.handleRequest(event);
+  if (responsePromise) {
+    event.respondWith(responsePromise);
+  }
+});
+
+export default router;
diff --git a/node_modules/workbox-routing/_public.mjs b/node_modules/workbox-routing/_public.mjs
new file mode 100644
index 00000000..dd93a617
--- /dev/null
+++ b/node_modules/workbox-routing/_public.mjs
@@ -0,0 +1,28 @@
+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import {RegExpRoute} from './RegExpRoute.mjs';
+import {Route} from './Route.mjs';
+import {Router} from './Router.mjs';
+import {NavigationRoute} from './NavigationRoute.mjs';
+import './_version.mjs';
+
+export {
+  RegExpRoute,
+  Route,
+  Router,
+  NavigationRoute,
+};
diff --git a/node_modules/workbox-routing/_types.mjs b/node_modules/workbox-routing/_types.mjs
new file mode 100644
index 00000000..c82319c3
--- /dev/null
+++ b/node_modules/workbox-routing/_types.mjs
@@ -0,0 +1,61 @@
+/*
+ Copyright 2016 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import './_version.mjs';
+
+/**
+ * The "match" callback is used to determine if a `Route` should handle a
+ * service worker's `fetch` event. Returning a truthy value means
+ * this `Route` will handle and respond to the event.
+ *
+ * Return `null` if this Route shouldn't match against the `fetch` event.
+ *
+ * Any truthy value returned by this callback will be passed to the
+ * Route's
+ * [handler callback]{@link workbox.routing.Route~handlerCallback}.
+ *
+ * @callback Route~matchCallback
+ * @param {Object} context
+ * @param {URL} context.url The request's URL.
+ * @param {FetchEvent} context.event The service worker`s `fetch`
+ * event.
+ * @return {Object|null} To signify a match, return anything other than `null`.
+ * Return `null` if the route shouldn't match.
+ * [handler]{@link workbox.routing.Route~handlerCallback}.
+ *
+ * @memberof workbox.routing
+ */
+
+/**
+ * The "handler" callback is called when a service worker's `fetch` event
+ * has been matched by a `Route`. This callback should return a Promise that
+ * resolves with a `Response`.
+ *
+ * If a value is returned by the
+ * [match callback]{@link workbox.routing.Route~matchCallback} it
+ * will be passed in as the `context.params` argument.
+ *
+ * @callback Route~handlerCallback
+ * @param {Object} context
+ * @param {URL} context.url The request's URL.
+ * @param {FetchEvent} context.event The service worker's `fetch`
+ * event.
+ * @param {Object} [context.params] Parameters returned by the Route's
+ * [match callback]{@link workbox.routing.Route~matchCallback} function.
+ * This will be undefined if nothing was returned.
+ * @return {Promise<Response>} The response that will fulfill the request.
+ *
+ * @memberof workbox.routing
+ */
diff --git a/node_modules/workbox-routing/_version.mjs b/node_modules/workbox-routing/_version.mjs
new file mode 100644
index 00000000..03befa43
--- /dev/null
+++ b/node_modules/workbox-routing/_version.mjs
@@ -0,0 +1 @@
+try{self.workbox.v['workbox:routing:3.6.3']=1;}catch(e){} // eslint-disable-line
\ No newline at end of file
diff --git a/node_modules/workbox-routing/browser.mjs b/node_modules/workbox-routing/browser.mjs
new file mode 100644
index 00000000..b01d2ff7
--- /dev/null
+++ b/node_modules/workbox-routing/browser.mjs
@@ -0,0 +1,24 @@
+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+
+import * as publicAPI from './_public.mjs';
+import defaultExport from './_default.mjs';
+import './_version.mjs';
+
+const finalExport = Object.assign(defaultExport, publicAPI);
+
+export default finalExport;
diff --git a/node_modules/workbox-routing/index.mjs b/node_modules/workbox-routing/index.mjs
new file mode 100644
index 00000000..074870d2
--- /dev/null
+++ b/node_modules/workbox-routing/index.mjs
@@ -0,0 +1,28 @@
+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import defaultExport from './_default.mjs';
+import './_version.mjs';
+
+/**
+ * @namespace workbox.routing
+ * @borrows workbox.routing.Router#setCatchHandler as setCatchHandler
+ * @borrows workbox.routing.Router#setDefaultHandler as setDefaultHandler
+ * @borrows workbox.routing.Router#unregisterRoute as unregisterRoute
+ */
+
+export * from './_public.mjs';
+export default defaultExport;
diff --git a/node_modules/workbox-routing/package.json b/node_modules/workbox-routing/package.json
new file mode 100644
index 00000000..7a0fdea8
--- /dev/null
+++ b/node_modules/workbox-routing/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "workbox-routing",
+  "version": "3.6.3",
+  "license": "Apache-2.0",
+  "author": "Google's Web DevRel Team",
+  "description": "A service worker helper library to route request URLs to handlers.",
+  "repository": "googlechrome/workbox",
+  "bugs": "https://github.com/googlechrome/workbox/issues",
+  "homepage": "https://github.com/GoogleChrome/workbox",
+  "keywords": [
+    "workbox",
+    "workboxjs",
+    "service worker",
+    "sw",
+    "router",
+    "routing"
+  ],
+  "scripts": {
+    "build": "gulp build-packages --package workbox-routing",
+    "version": "npm run build",
+    "prepare": "npm run build"
+  },
+  "workbox": {
+    "browserNamespace": "workbox.routing",
+    "packageType": "browser"
+  },
+  "main": "build/workbox-routing.prod.js",
+  "module": "index.mjs",
+  "dependencies": {
+    "workbox-core": "^3.6.3"
+  }
+}
diff --git a/node_modules/workbox-routing/utils/constants.mjs b/node_modules/workbox-routing/utils/constants.mjs
new file mode 100644
index 00000000..8acaf5cd
--- /dev/null
+++ b/node_modules/workbox-routing/utils/constants.mjs
@@ -0,0 +1,42 @@
+/*
+ Copyright 2017 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import '../_version.mjs';
+
+/**
+ * The default HTTP method, 'GET', used when there's no specific method
+ * configured for a route.
+ *
+ * @type {string}
+ *
+ * @private
+ */
+export const defaultMethod = 'GET';
+
+/**
+ * The list of valid HTTP methods associated with requests that could be routed.
+ *
+ * @type {Array<string>}
+ *
+ * @private
+ */
+export const validMethods = [
+  'DELETE',
+  'GET',
+  'HEAD',
+  'PATCH',
+  'POST',
+  'PUT',
+];
diff --git a/node_modules/workbox-routing/utils/normalizeHandler.mjs b/node_modules/workbox-routing/utils/normalizeHandler.mjs
new file mode 100644
index 00000000..b27187f8
--- /dev/null
+++ b/node_modules/workbox-routing/utils/normalizeHandler.mjs
@@ -0,0 +1,48 @@
+/*
+ Copyright 2017 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+import '../_version.mjs';
+
+/**
+ * @param {function()|Object} handler Either a function, or an object with a
+ * 'handle' method.
+ * @return {Object} An object with a handle method.
+ *
+ * @private
+ */
+export default (handler) => {
+  if (handler && typeof handler === 'object') {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.hasMethod(handler, 'handle', {
+        moduleName: 'workbox-routing',
+        className: 'Route',
+        funcName: 'constructor',
+        paramName: 'handler',
+      });
+    }
+    return handler;
+  } else {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isType(handler, 'function', {
+        moduleName: 'workbox-routing',
+        className: 'Route',
+        funcName: 'constructor',
+        paramName: 'handler',
+      });
+    }
+    return {handle: handler};
+  }
+};