Try to use JPA
Merge branch 'issue_40' of https://github.com/xaviermichel/simple-ged into issue_40

Conflicts:
	ged-core/src/main/java/com/simple/ged/Launcher.java
	ged-core/src/main/java/com/simple/ged/dao/GedDirectoryRepository.java
	ged-core/src/main/java/com/simple/ged/ui/screen/GetterPluginConfigurationScreen.java
	ged-core/src/main/java/com/simple/ged/ui/screen/WorkerPluginConfigurationScreen.java
Fix compilation