Start the simperium buckets in `onResume` of `NotificationsActivity`.
Added some helper methods to `SimperiumUtils` to check authorized status of user.
Ensure buckets are started in `NotificationsActivity`
Merge branch 'develop' into issue/1684-stuck-notifications
Use simperium 0.4.11 from the central maven repo.

Refs #1684
Merge pull request #1696 from wordpress-mobile/issue/1684-stuck-notifications

Simperium Connectivity Improvements