add LocalStorage plugin

plugins/googleDrive.js

@@ -5,7 +5,38 @@ function GoogleDrive() {
 };
 
 GoogleDrive.prototype.init = function() {
-  console.log('[googleDrive.js.3] init'); //TODO
+  console.log('[googleDrive.js.3] init GoogleDrive'); //TODO
 };
 
+
+GoogleDrive.prototype.getItem = function(k) {
+  return localStorage.getItem(k);
+};
+
+GoogleDrive.prototype.setItem = function(k,v) {
+  localStorage.setItem(k,v);
+};
+
+GoogleDrive.prototype.removeItem = function(k) { 
+  localStorage.removeItem(k);
+};
+
+GoogleDrive.prototype.clear = function() { 
+  localStorage.clear();
+};
+
+delete GoogleDrive.prototype.length;
+
+Object.defineProperty(GoogleDrive.prototype, 'length', {
+  get: function() {
+    return localStorage.length;
+  }
+});
+
+GoogleDrive.prototype.key = function(k) {
+  var v = localStorage.key(k);
+  return v;
+};
+
+
 module.exports = GoogleDrive;