Clean up generated files & changes for ant

The included generated files made the maintainer in me lose sleep at night haha. Prebuilt test apks may be reincluded.
Also include some changes to make building using ant and the android sdk somewhat easier.
After cloning, building a debug apk using ant should be as easy as:
    android update project --target <id> --path <path/to/atraci-android>
    ant debug
(Note: jdk7 and android-sdk required; do not include '<>' symbols)