contacts: Improve haptic feedback on dialpad

 * Vibrate on touch instead of release to improve UX.
 * Original code by m0vie in CM7, ported to JB_MR1.

Change-Id: I853a1a770b58c535270ed069bb16b14d5e666b66

Conflicts:
	src/com/android/contacts/dialpad/DialpadFragment.java