Add GRAPH_URL config option so that GRAPHITE_HOST is just the Graphite Host or ip.
update language of GRAPHITE_HOST a little, could still use some love
whitespace cleanup for pep8
Fixing #77 - Patched in the SafeUnpickler from Graphite Carbon
Fixing #92 - Satisfying missing module dependencies for SafeUnpickler class
Expose known metrics through /metrics.