use PendingIntent.FLAG_UPDATE_CURRENT in calls to PendingIntent.getActivity() to avoid re-using the same extra data on every intent.
Don't stick thread IDs in the Intent extra data. Always mark all threads read from notification.
Update registration strings
Support skipping password creation at setup
Merge pull request #453 from irv/master

Merge Fix issue #433
Fix issue #469: Hide "Clear Passphrase" if passphrase is disabled.
Merge pull request #495 from breser/issue469

Merge Fix issue #469: Hide "Clear Passphrase" if passphrase is disabled.