Move setup

[dcolligan]

Depends on #743

@david4096 this gives you the functionality you want (in, say, server directory):

$ pip uninstall -y ga4gh-schemas && pip install ../schemas && ga4gh_run_tests

[david4096]

Nice one on figuring out the google imports! @kozbo this will need your approval as it alters the release process. +1 from me, we'll want to follow this with some python specific usage documentation.