adding jpa persistency
add production and test persistence, load Derby EM in unit test fixture
create dao in test case and persist config in Derby
make sure DataAccessLayer saves configurations
fixed DAL findByUserId returning unexpected ID
added query support for ES in multiple hosts
adding possibility to support multiple hosts within IndexManager
refactoring of IndexManager with JPA completed.
updated yml template to support the ES marvel plugin, added cleanup and host support for unittest
fixing shutdown post request, broken TC operating volume assignment, wrong array operation, giving usage example in IndexManagerTest.java
merging addpersistency branch with master

Conflicts:
	backmeup-indexer-core/src/main/java/org/backmeup/index/ESConfigurationHandler.java
	backmeup-indexer-core/src/main/java/org/backmeup/index/IndexManager.java
	pom.xml