added api versioning example using the FOSRestBundle VerisonListener

I just checked .. if I do not register the mime types with version inside your negotiation lib, it does not find a match and returns null. essentially ``normalizePriorities()`` gives me the list of mime types that I pass into ``getBest()`` .. without registerin the mime types they are not included in the array returned by ``normalizePriorities()`` and then ``getBest()`` returns null when I have a mime type with a version.