Structural Changes: Renamed some files, moved som files in new package and removed some files

Renaming: ListViewAdapter -> ChallengeViewAdapter
Moving:   ErrorDialogFragment, ReceiveTransitionsIntentService from datastructure -> activities
          ChallengeInfoWindowAdapter, ChallengeListViewAdapter from datastructure -> activities.adapters
Deleting: MisteryActivity
          ChallengeInfoWindow
Adding Geofences, features for Challenge ListView, Routing, some Layout Changes and content for MysteryInfoActivity.
After Merge, adapting: picture IDs, MysteryInfoActivity, ChallengeState related code + LocationClient => GoogleApiClient

Correcting picture IDs in in JSON file
Changing design of MysteryInfoActivity to only diplay a hint when challenges all successful
Adapting the 'getting' and 'setting' of ChallengeState to SharedPreferences
Moving from deprecated LocationClient to GoogleApiClient after update of SDK Tools
	=> Hence adopting new way of dealing with Geofences