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diff --git a/node_modules/base64-js/LICENSE b/node_modules/base64-js/LICENSE
new file mode 100644
index 00000000..96d3f68a
--- /dev/null
+++ b/node_modules/base64-js/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014
+
+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/base64-js/README.md b/node_modules/base64-js/README.md
new file mode 100644
index 00000000..75325117
--- /dev/null
+++ b/node_modules/base64-js/README.md
@@ -0,0 +1,34 @@
+base64-js
+=========
+
+`base64-js` does basic base64 encoding/decoding in pure JS.
+
+[![build status](https://secure.travis-ci.org/beatgammit/base64-js.png)](http://travis-ci.org/beatgammit/base64-js)
+
+[![testling badge](https://ci.testling.com/beatgammit/base64-js.png)](https://ci.testling.com/beatgammit/base64-js)
+
+Many browsers already have base64 encoding/decoding functionality, but it is for text data, not all-purpose binary data.
+
+Sometimes encoding/decoding binary data in the browser is useful, and that is what this module does.
+
+## install
+
+With [npm](https://npmjs.org) do:
+
+`npm install base64-js` and `var base64js = require('base64-js')`
+
+For use in web browsers do:
+
+`<script src="base64js.min.js"></script>`
+
+## methods
+
+`base64js` has three exposed functions, `byteLength`, `toByteArray` and `fromByteArray`, which both take a single argument.
+
+* `byteLength` - Takes a base64 string and returns length of byte array
+* `toByteArray` - Takes a base64 string and returns a byte array
+* `fromByteArray` - Takes a byte array and returns a base64 string
+
+## license
+
+MIT
diff --git a/node_modules/base64-js/base64js.min.js b/node_modules/base64-js/base64js.min.js
new file mode 100644
index 00000000..0c621d35
--- /dev/null
+++ b/node_modules/base64-js/base64js.min.js
@@ -0,0 +1 @@
+(function(r){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=r()}else if(typeof define==="function"&&define.amd){define([],r)}else{var e;if(typeof window!=="undefined"){e=window}else if(typeof global!=="undefined"){e=global}else if(typeof self!=="undefined"){e=self}else{e=this}e.base64js=r()}})(function(){var r,e,n;return function(){function r(e,n,t){function o(f,i){if(!n[f]){if(!e[f]){var u="function"==typeof require&&require;if(!i&&u)return u(f,!0);if(a)return a(f,!0);var v=new Error("Cannot find module '"+f+"'");throw v.code="MODULE_NOT_FOUND",v}var d=n[f]={exports:{}};e[f][0].call(d.exports,function(r){var n=e[f][1][r];return o(n||r)},d,d.exports,r,e,n,t)}return n[f].exports}for(var a="function"==typeof require&&require,f=0;f<t.length;f++)o(t[f]);return o}return r}()({"/":[function(r,e,n){"use strict";n.byteLength=d;n.toByteArray=h;n.fromByteArray=p;var t=[];var o=[];var a=typeof Uint8Array!=="undefined"?Uint8Array:Array;var f="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";for(var i=0,u=f.length;i<u;++i){t[i]=f[i];o[f.charCodeAt(i)]=i}o["-".charCodeAt(0)]=62;o["_".charCodeAt(0)]=63;function v(r){var e=r.length;if(e%4>0){throw new Error("Invalid string. Length must be a multiple of 4")}var n=r.indexOf("=");if(n===-1)n=e;var t=n===e?0:4-n%4;return[n,t]}function d(r){var e=v(r);var n=e[0];var t=e[1];return(n+t)*3/4-t}function c(r,e,n){return(e+n)*3/4-n}function h(r){var e;var n=v(r);var t=n[0];var f=n[1];var i=new a(c(r,t,f));var u=0;var d=f>0?t-4:t;for(var h=0;h<d;h+=4){e=o[r.charCodeAt(h)]<<18|o[r.charCodeAt(h+1)]<<12|o[r.charCodeAt(h+2)]<<6|o[r.charCodeAt(h+3)];i[u++]=e>>16&255;i[u++]=e>>8&255;i[u++]=e&255}if(f===2){e=o[r.charCodeAt(h)]<<2|o[r.charCodeAt(h+1)]>>4;i[u++]=e&255}if(f===1){e=o[r.charCodeAt(h)]<<10|o[r.charCodeAt(h+1)]<<4|o[r.charCodeAt(h+2)]>>2;i[u++]=e>>8&255;i[u++]=e&255}return i}function s(r){return t[r>>18&63]+t[r>>12&63]+t[r>>6&63]+t[r&63]}function l(r,e,n){var t;var o=[];for(var a=e;a<n;a+=3){t=(r[a]<<16&16711680)+(r[a+1]<<8&65280)+(r[a+2]&255);o.push(s(t))}return o.join("")}function p(r){var e;var n=r.length;var o=n%3;var a=[];var f=16383;for(var i=0,u=n-o;i<u;i+=f){a.push(l(r,i,i+f>u?u:i+f))}if(o===1){e=r[n-1];a.push(t[e>>2]+t[e<<4&63]+"==")}else if(o===2){e=(r[n-2]<<8)+r[n-1];a.push(t[e>>10]+t[e>>4&63]+t[e<<2&63]+"=")}return a.join("")}},{}]},{},[])("/")});
diff --git a/node_modules/base64-js/index.js b/node_modules/base64-js/index.js
new file mode 100644
index 00000000..44c67664
--- /dev/null
+++ b/node_modules/base64-js/index.js
@@ -0,0 +1,151 @@
+'use strict'
+
+exports.byteLength = byteLength
+exports.toByteArray = toByteArray
+exports.fromByteArray = fromByteArray
+
+var lookup = []
+var revLookup = []
+var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
+
+var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+for (var i = 0, len = code.length; i < len; ++i) {
+  lookup[i] = code[i]
+  revLookup[code.charCodeAt(i)] = i
+}
+
+// Support decoding URL-safe base64 strings, as Node.js does.
+// See: https://en.wikipedia.org/wiki/Base64#URL_applications
+revLookup['-'.charCodeAt(0)] = 62
+revLookup['_'.charCodeAt(0)] = 63
+
+function getLens (b64) {
+  var len = b64.length
+
+  if (len % 4 > 0) {
+    throw new Error('Invalid string. Length must be a multiple of 4')
+  }
+
+  // Trim off extra bytes after placeholder bytes are found
+  // See: https://github.com/beatgammit/base64-js/issues/42
+  var validLen = b64.indexOf('=')
+  if (validLen === -1) validLen = len
+
+  var placeHoldersLen = validLen === len
+    ? 0
+    : 4 - (validLen % 4)
+
+  return [validLen, placeHoldersLen]
+}
+
+// base64 is 4/3 + up to two characters of the original data
+function byteLength (b64) {
+  var lens = getLens(b64)
+  var validLen = lens[0]
+  var placeHoldersLen = lens[1]
+  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
+}
+
+function _byteLength (b64, validLen, placeHoldersLen) {
+  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
+}
+
+function toByteArray (b64) {
+  var tmp
+  var lens = getLens(b64)
+  var validLen = lens[0]
+  var placeHoldersLen = lens[1]
+
+  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
+
+  var curByte = 0
+
+  // if there are placeholders, only get up to the last complete 4 chars
+  var len = placeHoldersLen > 0
+    ? validLen - 4
+    : validLen
+
+  for (var i = 0; i < len; i += 4) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 18) |
+      (revLookup[b64.charCodeAt(i + 1)] << 12) |
+      (revLookup[b64.charCodeAt(i + 2)] << 6) |
+      revLookup[b64.charCodeAt(i + 3)]
+    arr[curByte++] = (tmp >> 16) & 0xFF
+    arr[curByte++] = (tmp >> 8) & 0xFF
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  if (placeHoldersLen === 2) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 2) |
+      (revLookup[b64.charCodeAt(i + 1)] >> 4)
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  if (placeHoldersLen === 1) {
+    tmp =
+      (revLookup[b64.charCodeAt(i)] << 10) |
+      (revLookup[b64.charCodeAt(i + 1)] << 4) |
+      (revLookup[b64.charCodeAt(i + 2)] >> 2)
+    arr[curByte++] = (tmp >> 8) & 0xFF
+    arr[curByte++] = tmp & 0xFF
+  }
+
+  return arr
+}
+
+function tripletToBase64 (num) {
+  return lookup[num >> 18 & 0x3F] +
+    lookup[num >> 12 & 0x3F] +
+    lookup[num >> 6 & 0x3F] +
+    lookup[num & 0x3F]
+}
+
+function encodeChunk (uint8, start, end) {
+  var tmp
+  var output = []
+  for (var i = start; i < end; i += 3) {
+    tmp =
+      ((uint8[i] << 16) & 0xFF0000) +
+      ((uint8[i + 1] << 8) & 0xFF00) +
+      (uint8[i + 2] & 0xFF)
+    output.push(tripletToBase64(tmp))
+  }
+  return output.join('')
+}
+
+function fromByteArray (uint8) {
+  var tmp
+  var len = uint8.length
+  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
+  var parts = []
+  var maxChunkLength = 16383 // must be multiple of 3
+
+  // go through the array every three bytes, we'll deal with trailing stuff later
+  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
+    parts.push(encodeChunk(
+      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)
+    ))
+  }
+
+  // pad the end with zeros, but make sure to not forget the extra bytes
+  if (extraBytes === 1) {
+    tmp = uint8[len - 1]
+    parts.push(
+      lookup[tmp >> 2] +
+      lookup[(tmp << 4) & 0x3F] +
+      '=='
+    )
+  } else if (extraBytes === 2) {
+    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
+    parts.push(
+      lookup[tmp >> 10] +
+      lookup[(tmp >> 4) & 0x3F] +
+      lookup[(tmp << 2) & 0x3F] +
+      '='
+    )
+  }
+
+  return parts.join('')
+}
diff --git a/node_modules/base64-js/package.json b/node_modules/base64-js/package.json
new file mode 100644
index 00000000..b895034e
--- /dev/null
+++ b/node_modules/base64-js/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "base64-js",
+  "version": "1.3.0",
+  "description": "Base64 encoding/decoding in pure JS",
+  "keywords": [
+    "base64"
+  ],
+  "homepage": "https://github.com/beatgammit/base64-js",
+  "bugs": {
+    "url": "https://github.com/beatgammit/base64-js/issues"
+  },
+  "license": "MIT",
+  "author": "T. Jameson Little <t.jameson.little@gmail.com>",
+  "files": [
+    "test",
+    "index.js",
+    "base64js.min.js"
+  ],
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/beatgammit/base64-js.git"
+  },
+  "scripts": {
+    "build": "browserify -s base64js -r ./ | uglifyjs -m > base64js.min.js",
+    "lint": "standard",
+    "test": "npm run lint && npm run unit",
+    "unit": "tape test/*.js"
+  },
+  "devDependencies": {
+    "benchmark": "^2.1.4",
+    "browserify": "^14.0.0",
+    "standard": "*",
+    "tape": "4.x",
+    "uglify-js": "^2.8.29"
+  }
+}
diff --git a/node_modules/base64-js/test/big-data.js b/node_modules/base64-js/test/big-data.js
new file mode 100644
index 00000000..107e09ec
--- /dev/null
+++ b/node_modules/base64-js/test/big-data.js
@@ -0,0 +1,25 @@
+var test = require('tape')
+var b64 = require('../')
+
+test('convert big data to base64', function (t) {
+  var b64str, arr, i, length
+  var big = new Uint8Array(64 * 1024 * 1024)
+  for (i = 0, length = big.length; i < length; ++i) {
+    big[i] = i % 256
+  }
+  b64str = b64.fromByteArray(big)
+  arr = b64.toByteArray(b64str)
+  t.ok(equal(arr, big))
+  t.equal(b64.byteLength(b64str), arr.length)
+  t.end()
+})
+
+function equal (a, b) {
+  var i
+  var length = a.length
+  if (length !== b.length) return false
+  for (i = 0; i < length; ++i) {
+    if (a[i] !== b[i]) return false
+  }
+  return true
+}
diff --git a/node_modules/base64-js/test/convert.js b/node_modules/base64-js/test/convert.js
new file mode 100644
index 00000000..017a1332
--- /dev/null
+++ b/node_modules/base64-js/test/convert.js
@@ -0,0 +1,88 @@
+var test = require('tape')
+var b64 = require('../')
+var checks = [
+  'a',
+  'aa',
+  'aaa',
+  'hi',
+  'hi!',
+  'hi!!',
+  'sup',
+  'sup?',
+  'sup?!'
+]
+
+test('convert to base64 and back', function (t) {
+  t.plan(checks.length * 2)
+
+  for (var i = 0; i < checks.length; i++) {
+    var check = checks[i]
+    var b64Str, arr, str
+
+    b64Str = b64.fromByteArray(map(check, function (char) { return char.charCodeAt(0) }))
+
+    arr = b64.toByteArray(b64Str)
+    str = map(arr, function (byte) { return String.fromCharCode(byte) }).join('')
+
+    t.equal(check, str, 'Checked ' + check)
+    t.equal(b64.byteLength(b64Str), arr.length, 'Checked length for ' + check)
+  }
+})
+
+var data = [
+  [[0, 0, 0], 'AAAA'],
+  [[0, 0, 1], 'AAAB'],
+  [[0, 1, -1], 'AAH/'],
+  [[1, 1, 1], 'AQEB'],
+  [[0, -73, 23], 'ALcX']
+]
+
+test('convert known data to string', function (t) {
+  for (var i = 0; i < data.length; i++) {
+    var bytes = data[i][0]
+    var expected = data[i][1]
+    var actual = b64.fromByteArray(bytes)
+    t.equal(actual, expected, 'Ensure that ' + bytes + ' serialise to ' + expected)
+  }
+  t.end()
+})
+
+test('convert known data from string', function (t) {
+  for (var i = 0; i < data.length; i++) {
+    var expected = data[i][0]
+    var string = data[i][1]
+    var actual = b64.toByteArray(string)
+    t.ok(equal(actual, expected), 'Ensure that ' + string + ' deserialise to ' + expected)
+    var length = b64.byteLength(string)
+    t.equal(length, expected.length, 'Ensure that ' + string + ' has byte lentgh of ' + expected.length)
+  }
+  t.end()
+})
+
+function equal (a, b) {
+  var i
+  var length = a.length
+  if (length !== b.length) return false
+  for (i = 0; i < length; ++i) {
+    if ((a[i] & 0xFF) !== (b[i] & 0xFF)) return false
+  }
+  return true
+}
+
+function map (arr, callback) {
+  var res = []
+  var kValue, mappedValue
+
+  for (var k = 0, len = arr.length; k < len; k++) {
+    if ((typeof arr === 'string' && !!arr.charAt(k))) {
+      kValue = arr.charAt(k)
+      mappedValue = callback(kValue, k, arr)
+      res[k] = mappedValue
+    } else if (typeof arr !== 'string' && k in arr) {
+      kValue = arr[k]
+      mappedValue = callback(kValue, k, arr)
+      res[k] = mappedValue
+    }
+  }
+  return res
+}
diff --git a/node_modules/base64-js/test/corrupt.js b/node_modules/base64-js/test/corrupt.js
new file mode 100644
index 00000000..44c6e719
--- /dev/null
+++ b/node_modules/base64-js/test/corrupt.js
@@ -0,0 +1,10 @@
+var test = require('tape')
+var b64 = require('../')
+
+test('padding bytes found inside base64 string', function (t) {
+  // See https://github.com/beatgammit/base64-js/issues/42
+  var str = 'SQ==QU0='
+  t.deepEqual(b64.toByteArray(str), new Uint8Array([73]))
+  t.equal(b64.byteLength(str), 1)
+  t.end()
+})
diff --git a/node_modules/base64-js/test/url-safe.js b/node_modules/base64-js/test/url-safe.js
new file mode 100644
index 00000000..4382e06c
--- /dev/null
+++ b/node_modules/base64-js/test/url-safe.js
@@ -0,0 +1,24 @@
+var test = require('tape')
+var b64 = require('../')
+
+test('decode url-safe style base64 strings', function (t) {
+  var expected = [0xff, 0xff, 0xbe, 0xff, 0xef, 0xbf, 0xfb, 0xef, 0xff]
+
+  var str = '//++/++/++//'
+  var actual = b64.toByteArray(str)
+  for (var i = 0; i < actual.length; i++) {
+    t.equal(actual[i], expected[i])
+  }
+
+  t.equal(b64.byteLength(str), actual.length)
+
+  str = '__--_--_--__'
+  actual = b64.toByteArray(str)
+  for (i = 0; i < actual.length; i++) {
+    t.equal(actual[i], expected[i])
+  }
+
+  t.equal(b64.byteLength(str), actual.length)
+
+  t.end()
+})