Merge branch 'dev' into 'master'

.../java/at/tuwien/service/SchemaServiceIntegrationTest.java

...data-service/rest-service/src/test/resources/init/zoo.sql

...ervices/src/main/java/at/tuwien/mapper/MariaDbMapper.java

...ase/table/constraints/foreignKey/ForeignKeyReference.java

...tories/src/main/java/at/tuwien/mapper/DatabaseMapper.java

...tories/src/main/java/at/tuwien/mapper/MetadataMapper.java

...ice/rest-service/src/main/resources/application-local.yml

...rc/test/java/at/tuwien/mapper/MetadataMapperUnitTest.java

...main/java/at/tuwien/service/impl/DatabaseServiceImpl.java

...e/test/src/main/java/at/tuwien/test/AbstractUnitTest.java

...a-service/test/src/main/java/at/tuwien/test/BaseTest.java