added timer mode - basic

Change-Id: I96f507d16f555583dac1d26410aa3eedfb4ba047

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	src/com/android/camera/PhotoController.java
timer mode rework
-added countdown view
-stop timer if required

Change-Id: I5eac16e45ed5aa81aea956eb55c61717a1e32fc8