Index: frontend/node_modules/pify/index.js
===================================================================
--- frontend/node_modules/pify/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/pify/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,68 @@
+'use strict';
+
+var processFn = function (fn, P, opts) {
+	return function () {
+		var that = this;
+		var args = new Array(arguments.length);
+
+		for (var i = 0; i < arguments.length; i++) {
+			args[i] = arguments[i];
+		}
+
+		return new P(function (resolve, reject) {
+			args.push(function (err, result) {
+				if (err) {
+					reject(err);
+				} else if (opts.multiArgs) {
+					var results = new Array(arguments.length - 1);
+
+					for (var i = 1; i < arguments.length; i++) {
+						results[i - 1] = arguments[i];
+					}
+
+					resolve(results);
+				} else {
+					resolve(result);
+				}
+			});
+
+			fn.apply(that, args);
+		});
+	};
+};
+
+var pify = module.exports = function (obj, P, opts) {
+	if (typeof P !== 'function') {
+		opts = P;
+		P = Promise;
+	}
+
+	opts = opts || {};
+	opts.exclude = opts.exclude || [/.+Sync$/];
+
+	var filter = function (key) {
+		var match = function (pattern) {
+			return typeof pattern === 'string' ? key === pattern : pattern.test(key);
+		};
+
+		return opts.include ? opts.include.some(match) : !opts.exclude.some(match);
+	};
+
+	var ret = typeof obj === 'function' ? function () {
+		if (opts.excludeMain) {
+			return obj.apply(this, arguments);
+		}
+
+		return processFn(obj, P, opts).apply(this, arguments);
+	} : {};
+
+	return Object.keys(obj).reduce(function (ret, key) {
+		var x = obj[key];
+
+		ret[key] = typeof x === 'function' && filter(key) ? processFn(x, P, opts) : x;
+
+		return ret;
+	}, ret);
+};
+
+pify.all = pify;
Index: frontend/node_modules/pify/license
===================================================================
--- frontend/node_modules/pify/license	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/pify/license	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+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.
Index: frontend/node_modules/pify/package.json
===================================================================
--- frontend/node_modules/pify/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/pify/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,48 @@
+{
+  "name": "pify",
+  "version": "2.3.0",
+  "description": "Promisify a callback-style function",
+  "license": "MIT",
+  "repository": "sindresorhus/pify",
+  "author": {
+    "name": "Sindre Sorhus",
+    "email": "sindresorhus@gmail.com",
+    "url": "sindresorhus.com"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "xo && ava && npm run optimization-test",
+    "optimization-test": "node --allow-natives-syntax optimization-test.js"
+  },
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "promise",
+    "promises",
+    "promisify",
+    "denodify",
+    "denodeify",
+    "callback",
+    "cb",
+    "node",
+    "then",
+    "thenify",
+    "convert",
+    "transform",
+    "wrap",
+    "wrapper",
+    "bind",
+    "to",
+    "async",
+    "es2015"
+  ],
+  "devDependencies": {
+    "ava": "*",
+    "pinkie-promise": "^1.0.0",
+    "v8-natives": "0.0.2",
+    "xo": "*"
+  }
+}
Index: frontend/node_modules/pify/readme.md
===================================================================
--- frontend/node_modules/pify/readme.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/pify/readme.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,119 @@
+# pify [![Build Status](https://travis-ci.org/sindresorhus/pify.svg?branch=master)](https://travis-ci.org/sindresorhus/pify)
+
+> Promisify a callback-style function
+
+
+## Install
+
+```
+$ npm install --save pify
+```
+
+
+## Usage
+
+```js
+const fs = require('fs');
+const pify = require('pify');
+
+// promisify a single function
+
+pify(fs.readFile)('package.json', 'utf8').then(data => {
+	console.log(JSON.parse(data).name);
+	//=> 'pify'
+});
+
+// or promisify all methods in a module
+
+pify(fs).readFile('package.json', 'utf8').then(data => {
+	console.log(JSON.parse(data).name);
+	//=> 'pify'
+});
+```
+
+
+## API
+
+### pify(input, [promiseModule], [options])
+
+Returns a promise wrapped version of the supplied function or module.
+
+#### input
+
+Type: `function`, `object`
+
+Callback-style function or module whose methods you want to promisify.
+
+#### promiseModule
+
+Type: `function`
+
+Custom promise module to use instead of the native one.
+
+Check out [`pinkie-promise`](https://github.com/floatdrop/pinkie-promise) if you need a tiny promise polyfill.
+
+#### options
+
+##### multiArgs
+
+Type: `boolean`  
+Default: `false`
+
+By default, the promisified function will only return the second argument from the callback, which works fine for most APIs. This option can be useful for modules like `request` that return multiple arguments. Turning this on will make it return an array of all arguments from the callback, excluding the error argument, instead of just the second argument.
+
+```js
+const request = require('request');
+const pify = require('pify');
+
+pify(request, {multiArgs: true})('https://sindresorhus.com').then(result => {
+	const [httpResponse, body] = result;
+});
+```
+
+##### include
+
+Type: `array` of (`string`|`regex`)
+
+Methods in a module to promisify. Remaining methods will be left untouched.
+
+##### exclude
+
+Type: `array` of (`string`|`regex`)  
+Default: `[/.+Sync$/]`
+
+Methods in a module **not** to promisify. Methods with names ending with `'Sync'` are excluded by default.
+
+##### excludeMain
+
+Type: `boolean`  
+Default: `false`
+
+By default, if given module is a function itself, this function will be promisified. Turn this option on if you want to promisify only methods of the module.
+
+```js
+const pify = require('pify');
+
+function fn() {
+	return true;
+}
+
+fn.method = (data, callback) => {
+	setImmediate(() => {
+		callback(data, null);
+	});
+};
+
+// promisify methods but not fn()
+const promiseFn = pify(fn, {excludeMain: true});
+
+if (promiseFn()) {
+	promiseFn.method('hi').then(data => {
+		console.log(data);
+	});
+}
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)