Added some tests
Added some tests
Replaced getEntityById with getEntityByObject (class-check)
Fixed invalid check in clean()
Added some tests
Added cleanWithNotAddedObject() Registry-Test
Added test to check different classes in Registry
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/test/java/at/grueneis/spengergasse/registry/RegistryTest.java
Merge branch 'master' of https://github.com/daniel-lang/E-Framework into daniel-lang-master