implemented persistencemanager
changed dsl exceptions
Merge branch 'master' of
ssh://git@github.com/gertjan-ceyssens/CPL_Assignment2.git

Conflicts:
	code/cpl_assignment2/src/persistence/PersistenceManager.scala
Merge branch 'master' of ssh://git@github.com/gertjan-ceyssens/CPL_Assignment2.git

Conflicts:
	code/cpl_assignment2/src/connector/DatabaseConnector.scala
Merge branch 'master' of ssh://git@github.com/gertjan-ceyssens/CPL_Assignment2.git