First attempt for the notification process
Fix the login process: contacting the peers did not wait for answers
+ improvement: runs in same thread
Add tests for the notification
Implement the notification for add / update
First implementation of the download process
Fix the download and add to UseCaseUtils
Add DownloadFileTest
Switch to UseCaseUtil in one test
Merge branch 'process-refactoring-nico' into process-refactoring

Conflicts:
	org.hive2hive.processes/src/org/hive2hive/processes/ProcessFactory.java