travis: use conda
restructure index page a little
doc restructuring cont'd
remove misspelled file
one more addition to TOC
override the agogo template with includehiddentoc=True as per
https://bitbucket.org/birkenfeld/sphinx/src/72dceb35264e9429c8d9bb1a249a638ac21f0524/CHANGES#cl-40
via http://stackoverflow.com/a/20841272/814354