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diff --git a/node_modules/snapdragon-node/LICENSE b/node_modules/snapdragon-node/LICENSE
new file mode 100644
index 00000000..9a1c8567
--- /dev/null
+++ b/node_modules/snapdragon-node/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017, Jon Schlinkert
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/node_modules/snapdragon-node/README.md b/node_modules/snapdragon-node/README.md
new file mode 100644
index 00000000..2300a3cd
--- /dev/null
+++ b/node_modules/snapdragon-node/README.md
@@ -0,0 +1,453 @@
+# snapdragon-node [![NPM version](https://img.shields.io/npm/v/snapdragon-node.svg?style=flat)](https://www.npmjs.com/package/snapdragon-node) [![NPM monthly downloads](https://img.shields.io/npm/dm/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![NPM total downloads](https://img.shields.io/npm/dt/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/snapdragon-node.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/snapdragon-node)
+
+> Snapdragon utility for creating a new AST node in custom code, such as plugins.
+
+## Install
+
+Install with [npm](https://www.npmjs.com/):
+
+```sh
+$ npm install --save snapdragon-node
+```
+
+## Usage
+
+With [snapdragon](https://github.com/jonschlinkert/snapdragon) v0.9.0 and higher you can use `this.node()` to create a new `Node`, whenever it makes sense.
+
+```js
+var Node = require('snapdragon-node');
+var Snapdragon = require('snapdragon');
+var snapdragon = new Snapdragon();
+
+// example usage inside a parser visitor function
+snapdragon.parser.set('foo', function() {
+  // get the current "start" position
+  var pos = this.position();
+
+  // returns the match if regex matches the substring 
+  // at the current position on `parser.input`
+  var match = this.match(/foo/);
+  if (match) {
+    // call "pos" on the node, to set the start and end 
+    // positions, and return the node to push it onto the AST
+    // (snapdragon will push the node onto the correct
+    // nodes array, based on the stack)
+    return pos(new Node({type: 'bar', val: match[0]}));
+  }
+});
+```
+
+## API
+
+### [Node](index.js#L22)
+
+Create a new AST `Node` with the given `val` and `type`.
+
+**Params**
+
+* `val` **{String|Object}**: Pass a matched substring, or an object to merge onto the node.
+* `type` **{String}**: The node type to use when `val` is a string.
+* `returns` **{Object}**: node instance
+
+**Example**
+
+```js
+var node = new Node('*', 'Star');
+var node = new Node({type: 'star', val: '*'});
+```
+
+### [.isNode](index.js#L61)
+
+Returns true if the given value is a node.
+
+**Params**
+
+* `node` **{Object}**
+* `returns` **{Boolean}**
+
+**Example**
+
+```js
+var Node = require('snapdragon-node');
+var node = new Node({type: 'foo'});
+console.log(Node.isNode(node)); //=> true
+console.log(Node.isNode({})); //=> false
+```
+
+### [.define](index.js#L80)
+
+Define a non-enumberable property on the node instance. Useful for adding properties that shouldn't be extended or visible during debugging.
+
+**Params**
+
+* `name` **{String}**
+* `val` **{any}**
+* `returns` **{Object}**: returns the node instance
+
+**Example**
+
+```js
+var node = new Node();
+node.define('foo', 'something non-enumerable');
+```
+
+### [.isEmpty](index.js#L100)
+
+Returns true if `node.val` is an empty string, or `node.nodes` does not contain any non-empty text nodes.
+
+**Params**
+
+* `fn` **{Function}**: (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes.
+* `returns` **{Boolean}**
+
+**Example**
+
+```js
+var node = new Node({type: 'text'});
+node.isEmpty(); //=> true
+node.val = 'foo';
+node.isEmpty(); //=> false
+```
+
+### [.push](index.js#L118)
+
+Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
+
+**Params**
+
+* `node` **{Object}**
+* `returns` **{Number}**: Returns the length of `node.nodes`
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+foo.push(bar);
+```
+
+### [.unshift](index.js#L140)
+
+Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
+
+**Params**
+
+* `node` **{Object}**
+* `returns` **{Number}**: Returns the length of `node.nodes`
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+foo.unshift(bar);
+```
+
+### [.pop](index.js#L167)
+
+Pop a node from `node.nodes`.
+
+* `returns` **{Number}**: Returns the popped `node`
+
+**Example**
+
+```js
+var node = new Node({type: 'foo'});
+node.push(new Node({type: 'a'}));
+node.push(new Node({type: 'b'}));
+node.push(new Node({type: 'c'}));
+node.push(new Node({type: 'd'}));
+console.log(node.nodes.length);
+//=> 4
+node.pop();
+console.log(node.nodes.length);
+//=> 3
+```
+
+### [.shift](index.js#L190)
+
+Shift a node from `node.nodes`.
+
+* `returns` **{Object}**: Returns the shifted `node`
+
+**Example**
+
+```js
+var node = new Node({type: 'foo'});
+node.push(new Node({type: 'a'}));
+node.push(new Node({type: 'b'}));
+node.push(new Node({type: 'c'}));
+node.push(new Node({type: 'd'}));
+console.log(node.nodes.length);
+//=> 4
+node.shift();
+console.log(node.nodes.length);
+//=> 3
+```
+
+### [.remove](index.js#L205)
+
+Remove `node` from `node.nodes`.
+
+**Params**
+
+* `node` **{Object}**
+* `returns` **{Object}**: Returns the removed node.
+
+**Example**
+
+```js
+node.remove(childNode);
+```
+
+### [.find](index.js#L231)
+
+Get the first child node from `node.nodes` that matches the given `type`. If `type` is a number, the child node at that index is returned.
+
+**Params**
+
+* `type` **{String}**
+* `returns` **{Object}**: Returns a child node or undefined.
+
+**Example**
+
+```js
+var child = node.find(1); //<= index of the node to get
+var child = node.find('foo'); //<= node.type of a child node
+var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
+var child = node.find(['foo', 'bar']); //<= array of node.type(s)
+```
+
+### [.isType](index.js#L249)
+
+Return true if the node is the given `type`.
+
+**Params**
+
+* `type` **{String}**
+* `returns` **{Boolean}**
+
+**Example**
+
+```js
+var node = new Node({type: 'bar'});
+cosole.log(node.isType('foo'));          // false
+cosole.log(node.isType(/^(foo|bar)$/));  // true
+cosole.log(node.isType(['foo', 'bar'])); // true
+```
+
+### [.hasType](index.js#L270)
+
+Return true if the `node.nodes` has the given `type`.
+
+**Params**
+
+* `type` **{String}**
+* `returns` **{Boolean}**
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+foo.push(bar);
+
+cosole.log(foo.hasType('qux'));          // false
+cosole.log(foo.hasType(/^(qux|bar)$/));  // true
+cosole.log(foo.hasType(['qux', 'bar'])); // true
+```
+
+* `returns` **{Array}**
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+foo.push(bar);
+foo.push(baz);
+
+console.log(bar.siblings.length) // 2
+console.log(baz.siblings.length) // 2
+```
+
+* `returns` **{Number}**
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+var qux = new Node({type: 'qux'});
+foo.push(bar);
+foo.push(baz);
+foo.unshift(qux);
+
+console.log(bar.index) // 1
+console.log(baz.index) // 2
+console.log(qux.index) // 0
+```
+
+* `returns` **{Object}**
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+foo.push(bar);
+foo.push(baz);
+
+console.log(baz.prev.type) // 'bar'
+```
+
+* `returns` **{Object}**
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+foo.push(bar);
+foo.push(baz);
+
+console.log(bar.siblings.length) // 2
+console.log(baz.siblings.length) // 2
+```
+
+* `returns` **{Object}**: The first node, or undefiend
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+var qux = new Node({type: 'qux'});
+foo.push(bar);
+foo.push(baz);
+foo.push(qux);
+
+console.log(foo.first.type) // 'bar'
+```
+
+* `returns` **{Object}**: The last node, or undefiend
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+var qux = new Node({type: 'qux'});
+foo.push(bar);
+foo.push(baz);
+foo.push(qux);
+
+console.log(foo.last.type) // 'qux'
+```
+
+* `returns` **{Object}**: The last node, or undefiend
+
+**Example**
+
+```js
+var foo = new Node({type: 'foo'});
+var bar = new Node({type: 'bar'});
+var baz = new Node({type: 'baz'});
+var qux = new Node({type: 'qux'});
+foo.push(bar);
+foo.push(baz);
+foo.push(qux);
+
+console.log(foo.last.type) // 'qux'
+```
+
+## Release history
+
+Changelog entries are classified using the following labels from [keep-a-changelog](https://github.com/olivierlacan/keep-a-changelog):
+
+* `added`: for new features
+* `changed`: for changes in existing functionality
+* `deprecated`: for once-stable features removed in upcoming releases
+* `removed`: for deprecated features removed in this release
+* `fixed`: for any bug fixes
+
+Custom labels used in this changelog:
+
+* `dependencies`: bumps dependencies
+* `housekeeping`: code re-organization, minor edits, or other changes that don't fit in one of the other categories.
+
+### [2.0.0] - 2017-05-01
+
+**Changed**
+
+* `.unshiftNode` was renamed to [.unshift](#unshift)
+* `.pushNode` was renamed to [.push](#push)
+* `.getNode` was renamed to [.find](#find)
+
+**Added**
+
+* [.isNode](#isNode)
+* [.isEmpty](#isEmpty)
+* [.pop](#pop)
+* [.shift](#shift)
+* [.remove](#remove)
+
+### [0.1.0]
+
+First release.
+
+## About
+
+### Related projects
+
+* [breakdance](https://www.npmjs.com/package/breakdance): Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy… [more](http://breakdance.io) | [homepage](http://breakdance.io "Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy to use. It's time for your markup to get down.")
+* [snapdragon-capture](https://www.npmjs.com/package/snapdragon-capture): Snapdragon plugin that adds a capture method to the parser instance. | [homepage](https://github.com/jonschlinkert/snapdragon-capture "Snapdragon plugin that adds a capture method to the parser instance.")
+* [snapdragon-cheerio](https://www.npmjs.com/package/snapdragon-cheerio): Snapdragon plugin for converting a cheerio AST to a snapdragon AST. | [homepage](https://github.com/jonschlinkert/snapdragon-cheerio "Snapdragon plugin for converting a cheerio AST to a snapdragon AST.")
+* [snapdragon-util](https://www.npmjs.com/package/snapdragon-util): Utilities for the snapdragon parser/compiler. | [homepage](https://github.com/jonschlinkert/snapdragon-util "Utilities for the snapdragon parser/compiler.")
+* [snapdragon](https://www.npmjs.com/package/snapdragon): Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map… [more](https://github.com/jonschlinkert/snapdragon) | [homepage](https://github.com/jonschlinkert/snapdragon "Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map support.")
+
+### Contributing
+
+Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
+
+Please read the [contributing guide](.github/contributing.md) for advice on opening issues, pull requests, and coding standards.
+
+### Building docs
+
+_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
+
+To generate the readme, run the following command:
+
+```sh
+$ npm install -g verbose/verb#dev verb-generate-readme && verb
+```
+
+### Running tests
+
+Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
+
+```sh
+$ npm install && npm test
+```
+
+### Author
+
+**Jon Schlinkert**
+
+* [github/jonschlinkert](https://github.com/jonschlinkert)
+* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
+
+### License
+
+Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
+Released under the [MIT License](LICENSE).
+
+***
+
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on June 25, 2017._
\ No newline at end of file
diff --git a/node_modules/snapdragon-node/index.js b/node_modules/snapdragon-node/index.js
new file mode 100644
index 00000000..0f66ff5a
--- /dev/null
+++ b/node_modules/snapdragon-node/index.js
@@ -0,0 +1,492 @@
+'use strict';
+
+var isObject = require('isobject');
+var define = require('define-property');
+var utils = require('snapdragon-util');
+var ownNames;
+
+/**
+ * Create a new AST `Node` with the given `val` and `type`.
+ *
+ * ```js
+ * var node = new Node('*', 'Star');
+ * var node = new Node({type: 'star', val: '*'});
+ * ```
+ * @name Node
+ * @param {String|Object} `val` Pass a matched substring, or an object to merge onto the node.
+ * @param {String} `type` The node type to use when `val` is a string.
+ * @return {Object} node instance
+ * @api public
+ */
+
+function Node(val, type, parent) {
+  if (typeof type !== 'string') {
+    parent = type;
+    type = null;
+  }
+
+  define(this, 'parent', parent);
+  define(this, 'isNode', true);
+  define(this, 'expect', null);
+
+  if (typeof type !== 'string' && isObject(val)) {
+    lazyKeys();
+    var keys = Object.keys(val);
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i];
+      if (ownNames.indexOf(key) === -1) {
+        this[key] = val[key];
+      }
+    }
+  } else {
+    this.type = type;
+    this.val = val;
+  }
+}
+
+/**
+ * Returns true if the given value is a node.
+ *
+ * ```js
+ * var Node = require('snapdragon-node');
+ * var node = new Node({type: 'foo'});
+ * console.log(Node.isNode(node)); //=> true
+ * console.log(Node.isNode({})); //=> false
+ * ```
+ * @param {Object} `node`
+ * @returns {Boolean}
+ * @api public
+ */
+
+Node.isNode = function(node) {
+  return utils.isNode(node);
+};
+
+/**
+ * Define a non-enumberable property on the node instance.
+ * Useful for adding properties that shouldn't be extended
+ * or visible during debugging.
+ *
+ * ```js
+ * var node = new Node();
+ * node.define('foo', 'something non-enumerable');
+ * ```
+ * @param {String} `name`
+ * @param {any} `val`
+ * @return {Object} returns the node instance
+ * @api public
+ */
+
+Node.prototype.define = function(name, val) {
+  define(this, name, val);
+  return this;
+};
+
+/**
+ * Returns true if `node.val` is an empty string, or `node.nodes` does
+ * not contain any non-empty text nodes.
+ *
+ * ```js
+ * var node = new Node({type: 'text'});
+ * node.isEmpty(); //=> true
+ * node.val = 'foo';
+ * node.isEmpty(); //=> false
+ * ```
+ * @param {Function} `fn` (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes.
+ * @return {Boolean}
+ * @api public
+ */
+
+Node.prototype.isEmpty = function(fn) {
+  return utils.isEmpty(this, fn);
+};
+
+/**
+ * Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and
+ * set `foo` as `bar.parent`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * foo.push(bar);
+ * ```
+ * @param {Object} `node`
+ * @return {Number} Returns the length of `node.nodes`
+ * @api public
+ */
+
+Node.prototype.push = function(node) {
+  assert(Node.isNode(node), 'expected node to be an instance of Node');
+  define(node, 'parent', this);
+
+  this.nodes = this.nodes || [];
+  return this.nodes.push(node);
+};
+
+/**
+ * Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and
+ * set `foo` as `bar.parent`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * foo.unshift(bar);
+ * ```
+ * @param {Object} `node`
+ * @return {Number} Returns the length of `node.nodes`
+ * @api public
+ */
+
+Node.prototype.unshift = function(node) {
+  assert(Node.isNode(node), 'expected node to be an instance of Node');
+  define(node, 'parent', this);
+
+  this.nodes = this.nodes || [];
+  return this.nodes.unshift(node);
+};
+
+/**
+ * Pop a node from `node.nodes`.
+ *
+ * ```js
+ * var node = new Node({type: 'foo'});
+ * node.push(new Node({type: 'a'}));
+ * node.push(new Node({type: 'b'}));
+ * node.push(new Node({type: 'c'}));
+ * node.push(new Node({type: 'd'}));
+ * console.log(node.nodes.length);
+ * //=> 4
+ * node.pop();
+ * console.log(node.nodes.length);
+ * //=> 3
+ * ```
+ * @return {Number} Returns the popped `node`
+ * @api public
+ */
+
+Node.prototype.pop = function() {
+  return this.nodes && this.nodes.pop();
+};
+
+/**
+ * Shift a node from `node.nodes`.
+ *
+ * ```js
+ * var node = new Node({type: 'foo'});
+ * node.push(new Node({type: 'a'}));
+ * node.push(new Node({type: 'b'}));
+ * node.push(new Node({type: 'c'}));
+ * node.push(new Node({type: 'd'}));
+ * console.log(node.nodes.length);
+ * //=> 4
+ * node.shift();
+ * console.log(node.nodes.length);
+ * //=> 3
+ * ```
+ * @return {Object} Returns the shifted `node`
+ * @api public
+ */
+
+Node.prototype.shift = function() {
+  return this.nodes && this.nodes.shift();
+};
+
+/**
+ * Remove `node` from `node.nodes`.
+ *
+ * ```js
+ * node.remove(childNode);
+ * ```
+ * @param {Object} `node`
+ * @return {Object} Returns the removed node.
+ * @api public
+ */
+
+Node.prototype.remove = function(node) {
+  assert(Node.isNode(node), 'expected node to be an instance of Node');
+  this.nodes = this.nodes || [];
+  var idx = node.index;
+  if (idx !== -1) {
+    node.index = -1;
+    return this.nodes.splice(idx, 1);
+  }
+  return null;
+};
+
+/**
+ * Get the first child node from `node.nodes` that matches the given `type`.
+ * If `type` is a number, the child node at that index is returned.
+ *
+ * ```js
+ * var child = node.find(1); //<= index of the node to get
+ * var child = node.find('foo'); //<= node.type of a child node
+ * var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
+ * var child = node.find(['foo', 'bar']); //<= array of node.type(s)
+ * ```
+ * @param {String} `type`
+ * @return {Object} Returns a child node or undefined.
+ * @api public
+ */
+
+Node.prototype.find = function(type) {
+  return utils.findNode(this.nodes, type);
+};
+
+/**
+ * Return true if the node is the given `type`.
+ *
+ * ```js
+ * var node = new Node({type: 'bar'});
+ * cosole.log(node.isType('foo'));          // false
+ * cosole.log(node.isType(/^(foo|bar)$/));  // true
+ * cosole.log(node.isType(['foo', 'bar'])); // true
+ * ```
+ * @param {String} `type`
+ * @return {Boolean}
+ * @api public
+ */
+
+Node.prototype.isType = function(type) {
+  return utils.isType(this, type);
+};
+
+/**
+ * Return true if the `node.nodes` has the given `type`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * foo.push(bar);
+ *
+ * cosole.log(foo.hasType('qux'));          // false
+ * cosole.log(foo.hasType(/^(qux|bar)$/));  // true
+ * cosole.log(foo.hasType(['qux', 'bar'])); // true
+ * ```
+ * @param {String} `type`
+ * @return {Boolean}
+ * @api public
+ */
+
+Node.prototype.hasType = function(type) {
+  return utils.hasType(this, type);
+};
+
+/**
+ * Get the siblings array, or `null` if it doesn't exist.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * foo.push(bar);
+ * foo.push(baz);
+ *
+ * console.log(bar.siblings.length) // 2
+ * console.log(baz.siblings.length) // 2
+ * ```
+ * @return {Array}
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'siblings', {
+  set: function() {
+    throw new Error('node.siblings is a getter and cannot be defined');
+  },
+  get: function() {
+    return this.parent ? this.parent.nodes : null;
+  }
+});
+
+/**
+ * Get the node's current index from `node.parent.nodes`.
+ * This should always be correct, even when the parent adds nodes.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * var qux = new Node({type: 'qux'});
+ * foo.push(bar);
+ * foo.push(baz);
+ * foo.unshift(qux);
+ *
+ * console.log(bar.index) // 1
+ * console.log(baz.index) // 2
+ * console.log(qux.index) // 0
+ * ```
+ * @return {Number}
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'index', {
+  set: function(index) {
+    define(this, 'idx', index);
+  },
+  get: function() {
+    if (!Array.isArray(this.siblings)) {
+      return -1;
+    }
+    var tok = this.idx !== -1 ? this.siblings[this.idx] : null;
+    if (tok !== this) {
+      this.idx = this.siblings.indexOf(this);
+    }
+    return this.idx;
+  }
+});
+
+/**
+ * Get the previous node from the siblings array or `null`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * foo.push(bar);
+ * foo.push(baz);
+ *
+ * console.log(baz.prev.type) // 'bar'
+ * ```
+ * @return {Object}
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'prev', {
+  set: function() {
+    throw new Error('node.prev is a getter and cannot be defined');
+  },
+  get: function() {
+    if (Array.isArray(this.siblings)) {
+      return this.siblings[this.index - 1] || this.parent.prev;
+    }
+    return null;
+  }
+});
+
+/**
+ * Get the siblings array, or `null` if it doesn't exist.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * foo.push(bar);
+ * foo.push(baz);
+ *
+ * console.log(bar.siblings.length) // 2
+ * console.log(baz.siblings.length) // 2
+ * ```
+ * @return {Object}
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'next', {
+  set: function() {
+    throw new Error('node.next is a getter and cannot be defined');
+  },
+  get: function() {
+    if (Array.isArray(this.siblings)) {
+      return this.siblings[this.index + 1] || this.parent.next;
+    }
+    return null;
+  }
+});
+
+/**
+ * Get the first node from `node.nodes`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * var qux = new Node({type: 'qux'});
+ * foo.push(bar);
+ * foo.push(baz);
+ * foo.push(qux);
+ *
+ * console.log(foo.first.type) // 'bar'
+ * ```
+ * @return {Object} The first node, or undefiend
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'first', {
+  get: function() {
+    return this.nodes ? this.nodes[0] : null;
+  }
+});
+
+/**
+ * Get the last node from `node.nodes`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * var qux = new Node({type: 'qux'});
+ * foo.push(bar);
+ * foo.push(baz);
+ * foo.push(qux);
+ *
+ * console.log(foo.last.type) // 'qux'
+ * ```
+ * @return {Object} The last node, or undefiend
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'last', {
+  get: function() {
+    return this.nodes ? utils.last(this.nodes) : null;
+  }
+});
+
+/**
+ * Get the last node from `node.nodes`.
+ *
+ * ```js
+ * var foo = new Node({type: 'foo'});
+ * var bar = new Node({type: 'bar'});
+ * var baz = new Node({type: 'baz'});
+ * var qux = new Node({type: 'qux'});
+ * foo.push(bar);
+ * foo.push(baz);
+ * foo.push(qux);
+ *
+ * console.log(foo.last.type) // 'qux'
+ * ```
+ * @return {Object} The last node, or undefiend
+ * @api public
+ */
+
+Object.defineProperty(Node.prototype, 'scope', {
+  get: function() {
+    if (this.isScope !== true) {
+      return this.parent ? this.parent.scope : this;
+    }
+    return this;
+  }
+});
+
+/**
+ * Get own property names from Node prototype, but only the
+ * first time `Node` is instantiated
+ */
+
+function lazyKeys() {
+  if (!ownNames) {
+    ownNames = Object.getOwnPropertyNames(Node.prototype);
+  }
+}
+
+/**
+ * Simplified assertion. Throws an error is `val` is falsey.
+ */
+
+function assert(val, message) {
+  if (!val) throw new Error(message);
+}
+
+/**
+ * Expose `Node`
+ */
+
+exports = module.exports = Node;
diff --git a/node_modules/snapdragon-node/node_modules/define-property/LICENSE b/node_modules/snapdragon-node/node_modules/define-property/LICENSE
new file mode 100644
index 00000000..ec85897e
--- /dev/null
+++ b/node_modules/snapdragon-node/node_modules/define-property/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015, 2017, Jon Schlinkert
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/node_modules/snapdragon-node/node_modules/define-property/README.md b/node_modules/snapdragon-node/node_modules/define-property/README.md
new file mode 100644
index 00000000..2f1af05f
--- /dev/null
+++ b/node_modules/snapdragon-node/node_modules/define-property/README.md
@@ -0,0 +1,95 @@
+# define-property [![NPM version](https://img.shields.io/npm/v/define-property.svg?style=flat)](https://www.npmjs.com/package/define-property) [![NPM monthly downloads](https://img.shields.io/npm/dm/define-property.svg?style=flat)](https://npmjs.org/package/define-property)  [![NPM total downloads](https://img.shields.io/npm/dt/define-property.svg?style=flat)](https://npmjs.org/package/define-property) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/define-property.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/define-property)
+
+> Define a non-enumerable property on an object.
+
+## Install
+
+Install with [npm](https://www.npmjs.com/):
+
+```sh
+$ npm install --save define-property
+```
+
+Install with [yarn](https://yarnpkg.com):
+
+```sh
+$ yarn add define-property
+```
+
+## Usage
+
+**Params**
+
+* `obj`: The object on which to define the property.
+* `prop`: The name of the property to be defined or modified.
+* `descriptor`: The descriptor for the property being defined or modified.
+
+```js
+var define = require('define-property');
+var obj = {};
+define(obj, 'foo', function(val) {
+  return val.toUpperCase();
+});
+
+console.log(obj);
+//=> {}
+
+console.log(obj.foo('bar'));
+//=> 'BAR'
+```
+
+**get/set**
+
+```js
+define(obj, 'foo', {
+  get: function() {},
+  set: function() {}
+});
+```
+
+## About
+
+### Related projects
+
+* [assign-deep](https://www.npmjs.com/package/assign-deep): Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… [more](https://github.com/jonschlinkert/assign-deep) | [homepage](https://github.com/jonschlinkert/assign-deep "Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target (first) object.")
+* [extend-shallow](https://www.npmjs.com/package/extend-shallow): Extend an object with the properties of additional objects. node.js/javascript util. | [homepage](https://github.com/jonschlinkert/extend-shallow "Extend an object with the properties of additional objects. node.js/javascript util.")
+* [merge-deep](https://www.npmjs.com/package/merge-deep): Recursively merge values in a javascript object. | [homepage](https://github.com/jonschlinkert/merge-deep "Recursively merge values in a javascript object.")
+* [mixin-deep](https://www.npmjs.com/package/mixin-deep): Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone. | [homepage](https://github.com/jonschlinkert/mixin-deep "Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone.")
+
+### Contributing
+
+Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
+
+### Building docs
+
+_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
+
+To generate the readme, run the following command:
+
+```sh
+$ npm install -g verbose/verb#dev verb-generate-readme && verb
+```
+
+### Running tests
+
+Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
+
+```sh
+$ npm install && npm test
+```
+
+### Author
+
+**Jon Schlinkert**
+
+* [github/jonschlinkert](https://github.com/jonschlinkert)
+* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
+
+### License
+
+Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
+Released under the [MIT License](LICENSE).
+
+***
+
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 20, 2017._
\ No newline at end of file
diff --git a/node_modules/snapdragon-node/node_modules/define-property/index.js b/node_modules/snapdragon-node/node_modules/define-property/index.js
new file mode 100644
index 00000000..27c19ebf
--- /dev/null
+++ b/node_modules/snapdragon-node/node_modules/define-property/index.js
@@ -0,0 +1,31 @@
+/*!
+ * define-property <https://github.com/jonschlinkert/define-property>
+ *
+ * Copyright (c) 2015, 2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+var isDescriptor = require('is-descriptor');
+
+module.exports = function defineProperty(obj, prop, val) {
+  if (typeof obj !== 'object' && typeof obj !== 'function') {
+    throw new TypeError('expected an object or function.');
+  }
+
+  if (typeof prop !== 'string') {
+    throw new TypeError('expected `prop` to be a string.');
+  }
+
+  if (isDescriptor(val) && ('set' in val || 'get' in val)) {
+    return Object.defineProperty(obj, prop, val);
+  }
+
+  return Object.defineProperty(obj, prop, {
+    configurable: true,
+    enumerable: false,
+    writable: true,
+    value: val
+  });
+};
diff --git a/node_modules/snapdragon-node/node_modules/define-property/package.json b/node_modules/snapdragon-node/node_modules/define-property/package.json
new file mode 100644
index 00000000..e0ab1ca0
--- /dev/null
+++ b/node_modules/snapdragon-node/node_modules/define-property/package.json
@@ -0,0 +1,62 @@
+{
+  "name": "define-property",
+  "description": "Define a non-enumerable property on an object.",
+  "version": "1.0.0",
+  "homepage": "https://github.com/jonschlinkert/define-property",
+  "author": "Jon Schlinkert (https://github.com/jonschlinkert)",
+  "repository": "jonschlinkert/define-property",
+  "bugs": {
+    "url": "https://github.com/jonschlinkert/define-property/issues"
+  },
+  "license": "MIT",
+  "files": [
+    "index.js"
+  ],
+  "main": "index.js",
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "dependencies": {
+    "is-descriptor": "^1.0.0"
+  },
+  "devDependencies": {
+    "gulp-format-md": "^0.1.12",
+    "mocha": "^3.2.0"
+  },
+  "keywords": [
+    "define",
+    "define-property",
+    "enumerable",
+    "key",
+    "non",
+    "non-enumerable",
+    "object",
+    "prop",
+    "property",
+    "value"
+  ],
+  "verb": {
+    "related": {
+      "list": [
+        "extend-shallow",
+        "merge-deep",
+        "assign-deep",
+        "mixin-deep"
+      ]
+    },
+    "toc": false,
+    "layout": "default",
+    "tasks": [
+      "readme"
+    ],
+    "plugins": [
+      "gulp-format-md"
+    ],
+    "lint": {
+      "reflinks": true
+    }
+  }
+}
diff --git a/node_modules/snapdragon-node/package.json b/node_modules/snapdragon-node/package.json
new file mode 100644
index 00000000..2ca80237
--- /dev/null
+++ b/node_modules/snapdragon-node/package.json
@@ -0,0 +1,76 @@
+{
+  "name": "snapdragon-node",
+  "description": "Snapdragon utility for creating a new AST node in custom code, such as plugins.",
+  "version": "2.1.1",
+  "homepage": "https://github.com/jonschlinkert/snapdragon-node",
+  "author": "Jon Schlinkert (https://github.com/jonschlinkert)",
+  "repository": "jonschlinkert/snapdragon-node",
+  "bugs": {
+    "url": "https://github.com/jonschlinkert/snapdragon-node/issues"
+  },
+  "license": "MIT",
+  "files": [
+    "index.js"
+  ],
+  "main": "index.js",
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "dependencies": {
+    "define-property": "^1.0.0",
+    "isobject": "^3.0.0",
+    "snapdragon-util": "^3.0.1"
+  },
+  "devDependencies": {
+    "gulp": "^3.9.1",
+    "gulp-eslint": "^4.0.0",
+    "gulp-format-md": "^0.1.12",
+    "gulp-istanbul": "^1.1.2",
+    "gulp-mocha": "^3.0.1",
+    "mocha": "^3.4.2",
+    "snapdragon": "^0.11.0"
+  },
+  "keywords": [
+    "ast",
+    "compile",
+    "compiler",
+    "convert",
+    "node",
+    "parse",
+    "parser",
+    "plugin",
+    "render",
+    "snapdragon",
+    "snapdragonplugin",
+    "token",
+    "transform"
+  ],
+  "verb": {
+    "layout": "default",
+    "tasks": [
+      "readme"
+    ],
+    "plugins": [
+      "gulp-format-md"
+    ],
+    "related": {
+      "list": [
+        "breakdance",
+        "snapdragon",
+        "snapdragon-capture",
+        "snapdragon-cheerio",
+        "snapdragon-util"
+      ]
+    },
+    "reflinks": [
+      "verb",
+      "verb-generate-readme"
+    ],
+    "lint": {
+      "reflinks": true
+    }
+  }
+}