Allow setting of a custom notifcation on a per contact basis.

Change-Id: Ibe2d1d0e148f22793270bf351d52038081eee5fb

Conflicts:
	res/menu/view_contact.xml
	res/values/strings.xml
	src/com/android/contacts/ContactSaveService.java
	src/com/android/contacts/detail/ContactLoaderFragment.java
	src/com/android/contacts/model/Contact.java
	src/com/android/contacts/model/ContactLoader.java