DOC: links to pages on dev docs don't work anymore
For example, link provided by google when searching for 'pandas dataframe set_index': http://pandas.pydata.org/pandas-docs/dev/generated/pandas.DataFrame.set_index.html. 
This link does not work anymore, as it appears now the dev docs are hosted on http://pandas-docs.github.io/pandas-docs-travis/

@y-p Would it be possible to redirect or also put the build on the old place?

Maybe google on my computer is somewhat biased because of my browse history, but if I search for certain doc pages through google, it almost always returns the page on the dev docs.
