Cleanup

* Removed `gen/` and `bin/` directories
* Added `.gitignore` file from Catroid
* Fixed `.classpath` files (no more paths that are hardwired to a specific developers machine)
* Added ActionBarSherlock as a library Project
* Fixed imports

Musicdroid now builds without errors when importing into Eclipse.
Please discuss if you welcome these changes, I'll gladly answer any questions.


Note: I did not bother to fix the projects in `old/`.