[#2122] Unittest added for failing retrieving revision
[#2122] Changed the query for finding the right revision. Added a tests for creating the query. Changed the test for the storage. Removed a superfluous method in the EntityReducer
Set version to 2.1.1-SNAPSHOT
[#2123] Use a project specific entity for more realistic  unittests.
[#2123] Test added for delete of project specific type. Check added to only allow deletion of primitive entities.
Return method not allowed if you want to set the pid of a primitive entity.
[#2123] Updated the test.
Release 2.1.1
Merge branch 'develop' for version 2.1.1