Add billy project
Try to ensure Billy use our own PyPi
Since pip configuration is already set by balanced-omnibus, so it's not necessary to do it here again
Depend on our own libpq build (more secure)
Deal with version starts with "v"
Add psycopg2 for billy
Try to specify version of billy git repo
revert
Try to copy alembic to install dir
Add uwsgi
Fix directory already exist error
Make all uwsgi shit will be installed in embedded
Add ipython to billy dependencies