DBManager: Simple query function... Similar to the one of the MongoDBConnector. But also accessible from the client side.
DBManager.js: Sending the object data back to the client.
Viewer: Drag and drop from reference container to the viewer. Since the reference container does not have "real" hidden objects, so called fake hidden objects are used... Remember: The highlighting is stored at the hidden objects.

Testing necessary... This is nothing else, but a hack ;).
Merge branch 'develop' of github.com:winfel/wa_knowledge_structuring into develop