Allow retrieval of non-pypi dependency downloads with pip. Enables installation of python-graph-core in recent pip versions
More general fix for pip 1.5 compatibility, enabling install of python-graph-core and python-graph-dot from external non pypi sources
Merge pull request #246 from dgaston/master

Added storage of var.INFO OrderedDict in GEMINI DB
change to loading INFO by default, optionally skip.
handle when INFO is not loaded.