[OPENENGSB-3669] make QueryRequest object specially aware of given contextIds
[OPENENGSB-3666] Added read/write lock mechanism to the graph db using class to avoid sporadicly occuring concurrent modification exceptions
Merge pull request #861 from Arcticwolf/OPENENGSB-3669

[OPENENGSB-3669] make QueryRequest object specially aware of given contextIds
Merge pull request #862 from Arcticwolf/OPENENGSB-3666

[OPENENGSB-3666] Added read/write lock mechanism to the graph db class
[OPENENGSB-3670] fixed the problem with the wrong configuration in the integration tests
Merge pull request #864 from Arcticwolf/OPENENGSB-3670

[OPENENGSB-3670] fixed the problem with the wrong configuration in the integration tests
[OPENENGSB-3664] implemented context based concurrency management for the persist interface
[OPENENGSB-3664] started writing tests for the new feature
[OPENENGSB-3664] changed the implementation to a better way, added more tests
Merge pull request #865 from Arcticwolf/OPENENGSB-3664

[OPENENGSB-3664] concurrent write protection for the PersistInterface
Merge branch 'master' into sync

Conflicts:
	components/edb/src/main/java/org/openengsb/core/edb/jpa/internal/dao/DefaultJPADao.java
	components/edb/src/test/java/org/openengsb/core/edb/jpa/internal/EDBQueryTest.java