0.2.0

- integrates indexing into the api. Whenever a resource is modified the elasticsearch index will be updated in a synchronised call.
- fixes EDOZWO-190
- The usage of Fedora Content Models is reduced. Now, Content Models are only used to connect a so called Transformer to an existing resource. The Transformer must be available under /utils/transformerId. Example call:  ``curl -i -uadmin:admin -XPUT http://api.localhost/resource/test:1234 -d '{"type":"monograph", "transformer":["epicur"]}' -H "Content-Type:application/json"``
- the oai-ore representation includes filesize and checksum using http://downlode.org/Code/RDF/File_Properties/
- resource listings can be performed against elasticsearch OR repo, pagination is supported
- listing of transformers is possible, using type=transformer