Lockscreen: longpress on expand challenge handle

- Unsecure screen lock, long press will unlock the device
- Secure screen lock, long press and widget will fade into the background and secure method is displayed

Change-Id: I7d980f8e7e07226c97a64a63910a1410e6fb84c0
Merge "Lockscreen: longpress on expand challenge handle" into cm-10.1