Prepare for release 0.6
Updated app icons (ic_launcher.png) for release.
Corrected AndroidManifest so that the About activity is not externally
recognized.
Don't put Thumbs.db in the repository.
Added a mock Capture activity.
Forgot adding some files in the previous commit.
Updated ADT plugin :-)
Added the github URL on the About.
Last chance update before Release (0.6)

The changes include fixes on the lint warnings that were
to *revert* the changes suggested by the (older version of)
lint or manual fix of auto-generated files.  Hmm.