Notification framework started
Improved rollback of file deletion process
Notification framework applied to FileProcesses (not tested yet)
Disconnect: Wait for disconnecting
Merge branch 'master' into notification

Conflicts:
	org.hive2hive.core/src/org/hive2hive/core/model/MetaFolder.java
	org.hive2hive.core/src/org/hive2hive/core/process/upload/newversion/UpdateMetaDocumentStep.java
Add tests to NotificationProcess
Performance improvements for Notification
Add test for session
Test with notification of more than 2 different users