Allow for updates in the dependencies.
Enable proguard. Untested, bc. the release build is not yet signed
Add release-signing.
Make code with findbugs annotations survive proguard.
Retain the detail fragment across configuration changes (rotation).

Fixes the following bug: After rotating the screen, the fragment in the listactivity was null. This resulted in an NPE in the android stack bc. the TodoDeleted event handler passed null to the fragment transaction.