Update ansible to a recent devel version as proxy support is now fixed, the previous removal of pyurl had broken a number of things
Merge pull request #276 from jcftang/wip-ansible

Update ansible to a recent devel version as proxy support is now fixed, ...
Merge pull request #277 from lanewittgen/master

Add statsmodels package + dependencies.
Update README.md
Add yhat's ggplot + dependencies.