Refactored MuscleDataFragment and EquipmentDataFragment.

Both neary did the same thing, so I extracted a common superclass that can (and will) be used for even more fragments.
Split up the BasicDataFragment in NameFragment and DescriptionFragment.
Preparing release v0.6.1
Fix for crash isse #27.

Since the RecoveryTimerManager has been added the app crashed on Android 2.X.
Guess this is the reason for some 1 star Play Store reviews.
Merge branch 'create-custom-exercises'
Preparing release 0.6.2

Important Bugfix that fixes crash on Android 2.x