Code Cleanup
Add first unit test for TaskService
Refactoring: Moved ProjectService back into ejb module
Added TaskDto
Added new Exceptions
Enhanced AbstractEntity to auto generate UUID before persist an entity.
Enhanced Domain Model
Test to persist all objects bei cascading
Start implementing TaskService
Merge branch 'jat-berlin-1'

* jat-berlin-1:
  Start implementing TaskService
  Test to persist all objects bei cascading
  Enhanced Domain Model
  Enhanced AbstractEntity to auto generate UUID before persist an entity.
  Added new Exceptions
  Added TaskDto
  Refactoring: Moved ProjectService back into ejb module
  Add first unit test for TaskService
  Code Cleanup