initial commit of mediaresource api
finished first version of media ressource api
Merge branch 'master' into mediaresource

Conflicts:
	src/main/java/at/ait/dme/yuma/server/config/Config.java
	src/main/java/at/ait/dme/yuma/server/db/entities/MediaEntity.java
	src/main/resources/WEB-INF/applicationContext.xml
reworked media api
Merge branch 'master' into mediaresource

Conflicts:
	src/main/java/at/ait/dme/yuma/server/db/entities/MediaEntity.java
	src/main/java/at/ait/dme/yuma/server/service/CheckService.java
remove composite pk media content version
untested media api
Merge branch 'mediaresource'