Merge branch 'jb-notifications' of https://github.com/maniac103/k-9

* 'jb-notifications' of https://github.com/maniac103/k-9:
  Strip off signatures from preview.
  Reset list of unseen messages when the user clears the notification.
  In the new-style notification, directly go to message if new message count is 1.
  Cancel notification when viewing message by clicking on notification.
  Directly go to message when clicking on a single-message notification.
  Fix message overflow.
  Incorporate review comments.
  Some fixes to notification behaviour.
  Add German translation for message delete notification action.
  Add delete action to notification.
  Update summarized notification if a message is deleted or read remotely.
  Fixed deprecation warnings.
  Simplify code and beautify pre-jellybean notifications by using bold sender span for those.
  Respect "Show contact names" option when determining sender for notification.
  Fix marking messages as read from notification.
  Add German translation for new strings.
  Add actions to notifications.
  First stab at new notifications.
  Remove own Notification.Builder abstraction.
  Update android support library to latest version.