Index: frontend/node_modules/object-hash/index.js
===================================================================
--- frontend/node_modules/object-hash/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/object-hash/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,453 @@
+'use strict';
+
+var crypto = require('crypto');
+
+/**
+ * Exported function
+ *
+ * Options:
+ *
+ *  - `algorithm` hash algo to be used by this instance: *'sha1', 'md5'
+ *  - `excludeValues` {true|*false} hash object keys, values ignored
+ *  - `encoding` hash encoding, supports 'buffer', '*hex', 'binary', 'base64'
+ *  - `ignoreUnknown` {true|*false} ignore unknown object types
+ *  - `replacer` optional function that replaces values before hashing
+ *  - `respectFunctionProperties` {*true|false} consider function properties when hashing
+ *  - `respectFunctionNames` {*true|false} consider 'name' property of functions for hashing
+ *  - `respectType` {*true|false} Respect special properties (prototype, constructor)
+ *    when hashing to distinguish between types
+ *  - `unorderedArrays` {true|*false} Sort all arrays before hashing
+ *  - `unorderedSets` {*true|false} Sort `Set` and `Map` instances before hashing
+ *  * = default
+ *
+ * @param {object} object value to hash
+ * @param {object} options hashing options
+ * @return {string} hash value
+ * @api public
+ */
+exports = module.exports = objectHash;
+
+function objectHash(object, options){
+  options = applyDefaults(object, options);
+
+  return hash(object, options);
+}
+
+/**
+ * Exported sugar methods
+ *
+ * @param {object} object value to hash
+ * @return {string} hash value
+ * @api public
+ */
+exports.sha1 = function(object){
+  return objectHash(object);
+};
+exports.keys = function(object){
+  return objectHash(object, {excludeValues: true, algorithm: 'sha1', encoding: 'hex'});
+};
+exports.MD5 = function(object){
+  return objectHash(object, {algorithm: 'md5', encoding: 'hex'});
+};
+exports.keysMD5 = function(object){
+  return objectHash(object, {algorithm: 'md5', encoding: 'hex', excludeValues: true});
+};
+
+// Internals
+var hashes = crypto.getHashes ? crypto.getHashes().slice() : ['sha1', 'md5'];
+hashes.push('passthrough');
+var encodings = ['buffer', 'hex', 'binary', 'base64'];
+
+function applyDefaults(object, sourceOptions){
+  sourceOptions = sourceOptions || {};
+
+  // create a copy rather than mutating
+  var options = {};
+  options.algorithm = sourceOptions.algorithm || 'sha1';
+  options.encoding = sourceOptions.encoding || 'hex';
+  options.excludeValues = sourceOptions.excludeValues ? true : false;
+  options.algorithm = options.algorithm.toLowerCase();
+  options.encoding = options.encoding.toLowerCase();
+  options.ignoreUnknown = sourceOptions.ignoreUnknown !== true ? false : true; // default to false
+  options.respectType = sourceOptions.respectType === false ? false : true; // default to true
+  options.respectFunctionNames = sourceOptions.respectFunctionNames === false ? false : true;
+  options.respectFunctionProperties = sourceOptions.respectFunctionProperties === false ? false : true;
+  options.unorderedArrays = sourceOptions.unorderedArrays !== true ? false : true; // default to false
+  options.unorderedSets = sourceOptions.unorderedSets === false ? false : true; // default to false
+  options.unorderedObjects = sourceOptions.unorderedObjects === false ? false : true; // default to true
+  options.replacer = sourceOptions.replacer || undefined;
+  options.excludeKeys = sourceOptions.excludeKeys || undefined;
+
+  if(typeof object === 'undefined') {
+    throw new Error('Object argument required.');
+  }
+
+  // if there is a case-insensitive match in the hashes list, accept it
+  // (i.e. SHA256 for sha256)
+  for (var i = 0; i < hashes.length; ++i) {
+    if (hashes[i].toLowerCase() === options.algorithm.toLowerCase()) {
+      options.algorithm = hashes[i];
+    }
+  }
+
+  if(hashes.indexOf(options.algorithm) === -1){
+    throw new Error('Algorithm "' + options.algorithm + '"  not supported. ' +
+      'supported values: ' + hashes.join(', '));
+  }
+
+  if(encodings.indexOf(options.encoding) === -1 &&
+     options.algorithm !== 'passthrough'){
+    throw new Error('Encoding "' + options.encoding + '"  not supported. ' +
+      'supported values: ' + encodings.join(', '));
+  }
+
+  return options;
+}
+
+/** Check if the given function is a native function */
+function isNativeFunction(f) {
+  if ((typeof f) !== 'function') {
+    return false;
+  }
+  var exp = /^function\s+\w*\s*\(\s*\)\s*{\s+\[native code\]\s+}$/i;
+  return exp.exec(Function.prototype.toString.call(f)) != null;
+}
+
+function hash(object, options) {
+  var hashingStream;
+
+  if (options.algorithm !== 'passthrough') {
+    hashingStream = crypto.createHash(options.algorithm);
+  } else {
+    hashingStream = new PassThrough();
+  }
+
+  if (typeof hashingStream.write === 'undefined') {
+    hashingStream.write = hashingStream.update;
+    hashingStream.end   = hashingStream.update;
+  }
+
+  var hasher = typeHasher(options, hashingStream);
+  hasher.dispatch(object);
+  if (!hashingStream.update) {
+    hashingStream.end('');
+  }
+
+  if (hashingStream.digest) {
+    return hashingStream.digest(options.encoding === 'buffer' ? undefined : options.encoding);
+  }
+
+  var buf = hashingStream.read();
+  if (options.encoding === 'buffer') {
+    return buf;
+  }
+
+  return buf.toString(options.encoding);
+}
+
+/**
+ * Expose streaming API
+ *
+ * @param {object} object  Value to serialize
+ * @param {object} options  Options, as for hash()
+ * @param {object} stream  A stream to write the serializiation to
+ * @api public
+ */
+exports.writeToStream = function(object, options, stream) {
+  if (typeof stream === 'undefined') {
+    stream = options;
+    options = {};
+  }
+
+  options = applyDefaults(object, options);
+
+  return typeHasher(options, stream).dispatch(object);
+};
+
+function typeHasher(options, writeTo, context){
+  context = context || [];
+  var write = function(str) {
+    if (writeTo.update) {
+      return writeTo.update(str, 'utf8');
+    } else {
+      return writeTo.write(str, 'utf8');
+    }
+  };
+
+  return {
+    dispatch: function(value){
+      if (options.replacer) {
+        value = options.replacer(value);
+      }
+
+      var type = typeof value;
+      if (value === null) {
+        type = 'null';
+      }
+
+      //console.log("[DEBUG] Dispatch: ", value, "->", type, " -> ", "_" + type);
+
+      return this['_' + type](value);
+    },
+    _object: function(object) {
+      var pattern = (/\[object (.*)\]/i);
+      var objString = Object.prototype.toString.call(object);
+      var objType = pattern.exec(objString);
+      if (!objType) { // object type did not match [object ...]
+        objType = 'unknown:[' + objString + ']';
+      } else {
+        objType = objType[1]; // take only the class name
+      }
+
+      objType = objType.toLowerCase();
+
+      var objectNumber = null;
+
+      if ((objectNumber = context.indexOf(object)) >= 0) {
+        return this.dispatch('[CIRCULAR:' + objectNumber + ']');
+      } else {
+        context.push(object);
+      }
+
+      if (typeof Buffer !== 'undefined' && Buffer.isBuffer && Buffer.isBuffer(object)) {
+        write('buffer:');
+        return write(object);
+      }
+
+      if(objType !== 'object' && objType !== 'function' && objType !== 'asyncfunction') {
+        if(this['_' + objType]) {
+          this['_' + objType](object);
+        } else if (options.ignoreUnknown) {
+          return write('[' + objType + ']');
+        } else {
+          throw new Error('Unknown object type "' + objType + '"');
+        }
+      }else{
+        var keys = Object.keys(object);
+        if (options.unorderedObjects) {
+          keys = keys.sort();
+        }
+        // Make sure to incorporate special properties, so
+        // Types with different prototypes will produce
+        // a different hash and objects derived from
+        // different functions (`new Foo`, `new Bar`) will
+        // produce different hashes.
+        // We never do this for native functions since some
+        // seem to break because of that.
+        if (options.respectType !== false && !isNativeFunction(object)) {
+          keys.splice(0, 0, 'prototype', '__proto__', 'constructor');
+        }
+
+        if (options.excludeKeys) {
+          keys = keys.filter(function(key) { return !options.excludeKeys(key); });
+        }
+
+        write('object:' + keys.length + ':');
+        var self = this;
+        return keys.forEach(function(key){
+          self.dispatch(key);
+          write(':');
+          if(!options.excludeValues) {
+            self.dispatch(object[key]);
+          }
+          write(',');
+        });
+      }
+    },
+    _array: function(arr, unordered){
+      unordered = typeof unordered !== 'undefined' ? unordered :
+        options.unorderedArrays !== false; // default to options.unorderedArrays
+
+      var self = this;
+      write('array:' + arr.length + ':');
+      if (!unordered || arr.length <= 1) {
+        return arr.forEach(function(entry) {
+          return self.dispatch(entry);
+        });
+      }
+
+      // the unordered case is a little more complicated:
+      // since there is no canonical ordering on objects,
+      // i.e. {a:1} < {a:2} and {a:1} > {a:2} are both false,
+      // we first serialize each entry using a PassThrough stream
+      // before sorting.
+      // also: we can’t use the same context array for all entries
+      // since the order of hashing should *not* matter. instead,
+      // we keep track of the additions to a copy of the context array
+      // and add all of them to the global context array when we’re done
+      var contextAdditions = [];
+      var entries = arr.map(function(entry) {
+        var strm = new PassThrough();
+        var localContext = context.slice(); // make copy
+        var hasher = typeHasher(options, strm, localContext);
+        hasher.dispatch(entry);
+        // take only what was added to localContext and append it to contextAdditions
+        contextAdditions = contextAdditions.concat(localContext.slice(context.length));
+        return strm.read().toString();
+      });
+      context = context.concat(contextAdditions);
+      entries.sort();
+      return this._array(entries, false);
+    },
+    _date: function(date){
+      return write('date:' + date.toJSON());
+    },
+    _symbol: function(sym){
+      return write('symbol:' + sym.toString());
+    },
+    _error: function(err){
+      return write('error:' + err.toString());
+    },
+    _boolean: function(bool){
+      return write('bool:' + bool.toString());
+    },
+    _string: function(string){
+      write('string:' + string.length + ':');
+      write(string.toString());
+    },
+    _function: function(fn){
+      write('fn:');
+      if (isNativeFunction(fn)) {
+        this.dispatch('[native]');
+      } else {
+        this.dispatch(fn.toString());
+      }
+
+      if (options.respectFunctionNames !== false) {
+        // Make sure we can still distinguish native functions
+        // by their name, otherwise String and Function will
+        // have the same hash
+        this.dispatch("function-name:" + String(fn.name));
+      }
+
+      if (options.respectFunctionProperties) {
+        this._object(fn);
+      }
+    },
+    _number: function(number){
+      return write('number:' + number.toString());
+    },
+    _xml: function(xml){
+      return write('xml:' + xml.toString());
+    },
+    _null: function() {
+      return write('Null');
+    },
+    _undefined: function() {
+      return write('Undefined');
+    },
+    _regexp: function(regex){
+      return write('regex:' + regex.toString());
+    },
+    _uint8array: function(arr){
+      write('uint8array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _uint8clampedarray: function(arr){
+      write('uint8clampedarray:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _int8array: function(arr){
+      write('int8array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _uint16array: function(arr){
+      write('uint16array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _int16array: function(arr){
+      write('int16array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _uint32array: function(arr){
+      write('uint32array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _int32array: function(arr){
+      write('int32array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _float32array: function(arr){
+      write('float32array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _float64array: function(arr){
+      write('float64array:');
+      return this.dispatch(Array.prototype.slice.call(arr));
+    },
+    _arraybuffer: function(arr){
+      write('arraybuffer:');
+      return this.dispatch(new Uint8Array(arr));
+    },
+    _url: function(url) {
+      return write('url:' + url.toString(), 'utf8');
+    },
+    _map: function(map) {
+      write('map:');
+      var arr = Array.from(map);
+      return this._array(arr, options.unorderedSets !== false);
+    },
+    _set: function(set) {
+      write('set:');
+      var arr = Array.from(set);
+      return this._array(arr, options.unorderedSets !== false);
+    },
+    _file: function(file) {
+      write('file:');
+      return this.dispatch([file.name, file.size, file.type, file.lastModfied]);
+    },
+    _blob: function() {
+      if (options.ignoreUnknown) {
+        return write('[blob]');
+      }
+
+      throw Error('Hashing Blob objects is currently not supported\n' +
+        '(see https://github.com/puleos/object-hash/issues/26)\n' +
+        'Use "options.replacer" or "options.ignoreUnknown"\n');
+    },
+    _domwindow: function() { return write('domwindow'); },
+    _bigint: function(number){
+      return write('bigint:' + number.toString());
+    },
+    /* Node.js standard native objects */
+    _process: function() { return write('process'); },
+    _timer: function() { return write('timer'); },
+    _pipe: function() { return write('pipe'); },
+    _tcp: function() { return write('tcp'); },
+    _udp: function() { return write('udp'); },
+    _tty: function() { return write('tty'); },
+    _statwatcher: function() { return write('statwatcher'); },
+    _securecontext: function() { return write('securecontext'); },
+    _connection: function() { return write('connection'); },
+    _zlib: function() { return write('zlib'); },
+    _context: function() { return write('context'); },
+    _nodescript: function() { return write('nodescript'); },
+    _httpparser: function() { return write('httpparser'); },
+    _dataview: function() { return write('dataview'); },
+    _signal: function() { return write('signal'); },
+    _fsevent: function() { return write('fsevent'); },
+    _tlswrap: function() { return write('tlswrap'); },
+  };
+}
+
+// Mini-implementation of stream.PassThrough
+// We are far from having need for the full implementation, and we can
+// make assumptions like "many writes, then only one final read"
+// and we can ignore encoding specifics
+function PassThrough() {
+  return {
+    buf: '',
+
+    write: function(b) {
+      this.buf += b;
+    },
+
+    end: function(b) {
+      this.buf += b;
+    },
+
+    read: function() {
+      return this.buf;
+    }
+  };
+}