MUS-1: Renamed package from at.tugraz.musicdroid to org.catrobat.musicdroid
Update README.md

Added Link to Teampage
Merge pull request #16 from Catrobat/MUS-1_renamePackage

MUS-1: Renamed package from at.tugraz.musicdroid to org.catrobat.musicdroid
MUS-13: Merged master into this branch