Fixed testSoundTrackViewInactive und testLock
Update README.md
Merge branch 'master' into fixSoundTrackViewTest
MUS-21 Fixed SoundTrackViewTests
Removed unnecessary singletons
Merge pull request #17 from ElliHeschl/patch-1

Update README.md
Merge pull request #21 from Catrobat/removeSingletons

Removed unnecessary singletons
TrackCreator
Merge pull request #19 from Catrobat/fixSoundTrackViewTest

MUS-21 FIxed SoundTrackViewTests
merged