Revert "Revert "[#3,theme][m]: switch to standard okf sphinx theme - fixes #3."" - thereby reapplying new theme.

This reverts commit cfcd5c30a8febb5066fd70efd8ed0911a56a14dc.
[#3,theme][s]: some fixes for new theme.

* reinstate edit on github link lost in first pass
* require sphinx 1.2b3 (provides recent jquery plus respects :hidden: toc directive for generating global toc in sidebar)