Merge tag 'sparks-1.17.1' into develop

1.17.1
Move docs into ../
Set `Fabric` skip_bad_hosts env configuration to `True` by default.
Start our internal `Procfile` documentation. Sparse, as of now. We'll try to be as much conforming as possible to existing cloud platforms.
bump version in setup.py
Merge branch 'release/1.17.2'