+ added new GUserIdentity component, which should be used to check if user is authenticated against Google
+ added check for Dev / production in main.php
+ added 2 versions of basePath for assetManager component (dev / prod) in main.php config
+ added 2 versions of baseUrl for assetManager component (dev / prod) in main.php config
+ added ability to login via Google
+ changed app.yaml so it is possible to load assets from assets folder on dev machine