Merge pull request #3 from JanMalte/patch-1

changed version of ZfcUser dependency
Fixed issue with dev-master of ZfcUser
Merge branch 'master' of https://github.com/stijnhau/PrivateMessaging.git
Use same action for received and sent messages.
Changes so that a delete by receiver will make it invisible
Fixed issue with is_starred_or_not
Configrable field for sending.
Show sender in list by customField
- Removed unused use statements and functions
- Added phpstorm directory to gittignore.
- Sender by configurable field in message
- Extra comments
- Minor improvement