OCSADV-27: VoTableClient

This is a small PR containing VoTableClient. It uses the http commons client library to produce a method that returns a Future[CatalogProblem \/ ParsedVoResource] after making a call to one of the Gemini catalogs

A few rawtype warnings were removed as well
I think you are right, a leftMap is what I want. essentially convert the exception into my `CatalogProblem`