storage: datastore dependency updated to 0.3.0
catalog: major changes applied to study and file. Tests being done.
catalog: Replaced "Index.java" for File.type=TYPE_INDEX
catalog: Fixed index attributes and indexation file location.
catalog: Fixed modify study uri.
catalog: Added new job state: PREPARED. A prepared job will be submited to the SGEManager by the daemon.
catalog: Implemented file deletion. New states "deleting" and "deleted".
Merge branch 'feature/catalog' into feature/refactoring

Conflicts:
	opencga-server/src/main/java/org/opencb/opencga/server/FileWSServer.java
	opencga-server/src/main/java/org/opencb/opencga/server/StudyWSServer.java