Lots of keyguard improvements

- Fix "too many attempts" dialogs
- Fix account unlock mechanism so the user can use email account as backup for pattern unlock
- Add mechanism to support future account recovery from non-pattern screen
- Tune animation timing for flipping security view.
- Move password field to the top of the security view
- Add padding and visual feedback to navigation area button

Fixes bugs 7088482, 7088631

Change-Id: I23099feae3b7446ec291d8f860601bfc12f9edd8