Generate pincode for every new created team
Show pincode after creating a team
Less frequent updates of the notification for photo upload (to prevent crashes of the Android system)
Merge remote-tracking branch 'origin/master'

Conflicts:
	OutdoorPuzzleGame/src/main/java/com/peerke/outdoorpuzzlegame/services/communication/UploadPhotoTask.java
Less frequent updates of the notification for photo upload (to prevent crashes of the Android system)