pypackage: consistent logging + py3 support
Rework vcs feature to break out each flavor into own method.

Make git flavor separate a "download" and an "unpack" step
Advance LBNE config a bit.
Merge pull request #28 from hwaf/wip/py3-support

pypackage: consistent logging + py3 support
Merge branch 'master' of github.com:brettviren/worch