Sync Github API Token with Google Cloud and updates the
panel dynamically with the existing notifications
Add update-now button to force update and added footer showing
number of notifications not shown.
added the mark as read button.

note: the mark as read action is commented out during the testing phase.
little performance optimization when creating the panel
Testing chrome's alarms API
Get actions
bugfix 1/2 extension does not bring all notifications
bugfix 2/2 extension does not bring all notifications
comment out debug messages