Google Drive integration

Hi developers!

After month of vacations in the States (including Google IO) I'm full of energy to do something more ;)

Some of you complains that Google Drive integration isn't working well. I do my best to fix any issues but it is not simple. Google Dive have poor integration with Chrome Extensions and GWT. So I had to write it from scratch. I've noticed by myself that sometimes after login dialog close nothing happen. Reload the application usually helps but it shouldn't work this way.

Finally I will fix problems with Drive. Once it's ready I will disable app server for storing and sharing requests.

Happy RESTing.