Restores tracking notifications detail view.

Confirmed event is showing up in mixpanel develop. Fixes #1995.
Merge branch 'release/3.4' into develop
update to undobar 1.6
Ignore `INDEX` changes in the bucket listener in `NotificationsDetailListFragment`.

Change local status of note only when we receive a `MODIFY` type from symposium in `NotificationsListFragment`.

Fixes #2000.
Merge branch 'release/3.4' into develop
Merge pull request #2001 from wordpress-mobile/issue/2000-simperium-index-exception

Check Bucket.ChangeType in Simperium Bucket Listeners
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into feature/calypso-stats