Chaos Fahrplan 30C3 with colored tracks

Hi tuxmobil, I continued SubOptimal's work and 
- added the colors for the different tracks,
- added ActionBarSherlock as git submodule,
- Removed some old ActionBar stuff from config files,
- updated Eclipse and App settings,
- changed the name in "Chaos Fahrplan 30C3",
- changed package name in chaos.fahrplan.congress,
- updated README,
- updated copyright w.r.t. SubOptimal's and my contributions,

and finally
- added a signed APK in the Release directory: https://github.com/entropynil/ChaosFahrplan/raw/master/Release/ChaosFahrplan30C3.apk