added support for localstorage

js/services/storage.js

@@ -0,0 +1,22 @@
+'use strict';
+
+angular.module('copay.storage')
+  .factory('Storage', function($rootScope) {
+    return {        
+      get: function(key) {
+       return  JSON.parse(localStorage.getItem(key));
+      },
+
+      save: function(key, data) {
+       localStorage.setItem(key, JSON.stringify(data));
+      },
+
+      remove: function(key) {
+        localStorage.removeItem(key);
+      },
+      
+      clearAll: function() {
+        localStorage.clear();
+      }
+    };
+  });