adding dev files to master

adding all the dev files, package, webpack etc, including build which will contain minified release

src/helpers/PersistentSyncStorage.js

@@ -0,0 +1,51 @@
+import { SyncStorage } from '../utils/chrome';
+import { EventEmitter } from 'events';
+
+class PersistentSyncStorage extends EventEmitter {
+  constructor() {
+    super();
+
+    this._data = null;
+    this.state = 'initiating';
+
+    this._init();
+  }
+
+  async _init() {
+    const fetchedData = await SyncStorage.get();
+    this._initListener();
+    this._data = fetchedData;
+    this.state = 'ready';
+    this.emit(this.state);
+  }
+
+  _initListener() {
+    SyncStorage.listen((changes) => {
+
+      Object.keys(changes).forEach((changeKey) => {
+        if(changes[changeKey].hasOwnProperty('newValue')) {
+          this._data[changeKey] = changes[changeKey].newValue;
+        } else {
+          console.error('No newValue in sync storge change');
+        }
+      });
+      
+      this.emit('change', this.data, changes);
+    });
+  }
+
+  set(items) {
+    return SyncStorage.set(items);
+  }
+  
+  get data() {
+    return this._data;
+  }
+
+
+  has(item) {
+    return this.data.hasOwnProperty(item);
+  }
+}
+
+export default new PersistentSyncStorage();