* working API commander
* adding XSLT for EDMX -> OAI
* moved sample metadata files to their own directory.
* improvements to readability and handling
* working serializer
* build producing working JAR in /out/artifacts/...
* added saveRawGetRequest and fixed readEntities
* added support for filter expressions in readEntities, which was also re-written
* adding more correct command line handling
* adding README and ready for PR
* added further exception handling to validateMetadata