Update Android Gradle plugin

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Update buildToolsVersion to 19.1.0

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Set compileSdkVersion to 19

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Update support library to 19.1.0

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Set targetSdkVersion to 19

Signed-off-by: Eddie Ringle <eddie@eringle.net>