Add support for updating cards in real time.

Add fields to PublishableCard that allow a card to be identified on a
global scope as well as in a single ContentProvider. Rename
CMHomeApiService to CMHomeApiManager and add handling for card upating,
removal and addition.

Change-Id: I5638be14e9279eba11ccbb512648e1020381e768
Remove service reference from Manifest.

Change-Id: I520338cc88b769d8cb66a7195a6c8d8a976bb547