switch sphinx theme to one based on statsmodel

Close rmcgibbo/mdtraj#109

Squashed commit of the following:

commit e46ffdcc4bb0730b4d43779023127d10f4a56c96
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 18:30:44 2013 -0700

    Switched sphinx themes to one based on statsmodels, because it looks really good. I'm also using their code to automatically generate examples -- basically you write the script and it runs it, generating output and matplotlib plots, that get put into the html. Pretty cool.

commit 924361042f4d078860acf05f5ba3128328b99e8e
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 17:32:50 2013 -0700

    more sphinx stuff. this stuff is going to help make automatically generated examples that look like ipython notebooks

commit 2856c4d97a099bd4aeed6d0ca9969fdef193e780
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 17:32:09 2013 -0700

    typo fix in makefile

commit 4189026f5380d6103f6be31ef87f3bc011578578
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 17:31:21 2013 -0700

    remove obnoxious print statement that says TODO, and instead open an issue on github

commit 3c61aba42e2a9dbfc276b739f1b62bf074db1a66
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 17:30:43 2013 -0700

    add ipython-style sphinx formatting

commit 0376dc8dc439926871e5633f34679399261ac4f6
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 15:51:37 2013 -0700

    restored the docs makefile

commit fd11ca937812332bdfb424557e20dff7eeeb7849
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 15:47:48 2013 -0700

    added tools to generate sphinx examples

commit b666fc72f154aa8ba617ab0167823764e746094a
Author: Robert McGibbon <rmcgibbo@gmail.com>
Date:   Sun Jun 30 15:35:38 2013 -0700

    some cleanup of the namespace; make a tools directory, and move add_license.sh into it