Add ability to exclude apps from the sidebar [1/2]

Change-Id: Ia4d9b2590a228fd1b8ad95a68919cfd3b062213b
Add a receiver to listen for packages being added and removed so the sidebar can reflect those changes.

Change-Id: I336734060f3064fcc3f60d9f48d4a33308a3f20e
Merge "Add ability to exclude apps from the sidebar [1/2]" into jellybean-mr1
Merge "Add a receiver to listen for packages being added and removed so the sidebar can reflect those changes." into jellybean-mr1