app: Move GCMHelper to com.meiste.greg.gcm to be consistent. Closes #7

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Add ContentProvider and SyncAdapter

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
app: Just use default server registered flag lifespan

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
app: Shorten app name to "RasPi Temp Alarm"

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>