Moved the authentication logic to GoogleAuthenticationActivity
Extracted authentication logic to AppEngineDashboardAuthenticator
Extracted getting the applications list to AppEngineDashboardClient
Deleted the model mockup classes
GoogleAuthenticationActivity calls the authentication method
Added the postAuthentication callback in the activity
Added debugging logs
Set GoogleAuthenticationActivity as the main activity and renamed MainActivity to DashboardActivity
AuthenticationActivity starts the DashboardActivity on success
Added the AppEngineDashboardAPI singleton
AuthenticationActivity uses the API
Removed the redundant getAccounts method
Removed GoogleAuthenticationActivity from the history
Removing AuthenticationActivity from the history
Added a progress dialog to the authentication flow
Refactored Callback interface to be more general