Currently, the dev page seems out of date. Is it intended?
See:
http://scikit-learn.org/dev/index.html (missing 0.18.2, 0.19.0)

http://scikit-learn.org/stable/index.html

http://scikit-learn.org/dev/documentation.html (dev seems to be 0.20? the 0.18 link is now linked to 0.19.)