Initiate the http-client-impl project with implementation for Fedora Resource and FedoraRepository.getObject() method.

This PR initiate the http-client-impl project with Fedora Resource and FedoraRepository.getObject() method implemented that we can work on in the next step. There are no unit test added yet and I'll do it later so that it Esme can move ahead with his work.
I think this is still going to result in all the triples being loaded in memory when getCollected() is called.  Please use the java.util.concurrent background processing, demonstrated here:

https://svn.apache.org/repos/asf/jena/trunk/jena-arq/src-examples/arq/examples/riot/ExRIOT_6.java