Content types with parameters should be stripped out before translating them into RDF formats

fixes https://www.pivotaltracker.com/story/show/70599014"
Update RdfAdder and RdfRemover to use #getJcrNameForRdfNode machinery for translating a RDF resource into a JCR name

Resolves: https://www.pivotaltracker.com/story/show/70612500
Add HTTP headers (Allow, Accept-*) from OPTIONS to GET/HEAD requests

Resolves: https://www.pivotaltracker.com/story/show/70628122
added @author tag to java files missing it; updated checkstyle dep