Add support for incremental updates

Change-Id: I867f5b98851694ecb620d2ce026d224040166fa7
CMUpdater: Use solid action bar

Use the same action bar as the rest of the Settings activity

Change-Id: I3f24cbdda22eb8da6050db33eb2f97e0640d6611
Update json URL

Change-Id: Ibb78faa69e02037a8216111f3bdb69fa7eee1f84