[NO MERGE] Add bitcoinj0.12 flavor.
Require Android 4.0.3 (Ice Cream Sandwich). Get rid of ActionBarSherlock and pull android-support dependencies from repository provided by the SDK.
WIP
- Crashes at several places.
- AppWidget wrong divider and size.
IDEAS
- Switch backups to not write to external storage any more. It will need android.support.v4.content.FileProvider to create an URI that can be shared with other processes (e.g. Google Drive).
Implement onTrimMemory() for application and service.
Configure continuous integration using Travis CI.