Initial commit of Sphinx website

This is a basic Sphinx configuration generating a reference manual and inheritance diagrams. You can view it here http://philippjfr.github.com/param. 

This will begin to standardize documentation across IOAM projects. It also means I can set up intersphinx, which allows us to link to param classes from within the documentation of other projects, i.e. inheritance diagrams in DataViews or Topographica would point to the param documentation if a class inherits from param. 

We've already created the DataViews website (http://ioam.github.io/dataviews), which includes integrated IPython Notebook tutorials. That seems like overkill for the Param website though.