Added more tests

.../src/main/java/at/tuwien/endpoints/ContainerEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/ImageEndpoint.java

...e/src/main/java/at/tuwien/endpoints/DatabaseEndpoint.java

...ce/src/main/java/at/tuwien/endpoints/LicenseEndpoint.java

...src/main/java/at/tuwien/endpoints/IdentifierEndpoint.java

...n/entities/database/table/columns/TableColumnConcept.java

...wien/entities/database/table/columns/TableColumnUnit.java

...tadata-db/test/src/main/java/at/tuwien/test/BaseTest.java

...rvice/src/main/java/at/tuwien/endpoint/QueryEndpoint.java

...rvice/src/main/java/at/tuwien/endpoint/StoreEndpoint.java

...rc/main/java/at/tuwien/endpoint/TableHistoryEndpoint.java

...ervice/src/main/java/at/tuwien/endpoint/ViewEndpoint.java

...e/src/main/java/at/tuwien/endpoints/OntologyEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/QueryEndpoint.java

.../src/main/java/at/tuwien/endpoints/SemanticsEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/TableEndpoint.java

...est/java/at/tuwien/endpoint/OntologyEndpointUnitTest.java

...c/test/java/at/tuwien/endpoint/QueryEndpointUnitTest.java

...st/java/at/tuwien/endpoint/SemanticsEndpointUnitTest.java

...src/test/java/at/tuwien/service/QueryServiceUnitTest.java