Prepare the base for including js graphs

 * This huge commit addes the _page.html template
   with inclusion of the d3 and nvd3 static files
 * Remove some more references to pngs
 * Remove the pngs themselves from the tree
 * Remove all references to hard coded images
 * Add js css and page template
Replace automodule instructions with autoclass

All the classes are available from nvd3 directly,
so it make sense to treat them as classes rather then module.
That said, the modules containing the classes, are pointed from
the module index!
Replace hard coded js with cloudflare
Improve README.rst

Usage and teaser  before boring technical details
all classes now include live js code
Small improvements of the documentation
Merge pull request #69 from oz123/sphinx_doc

Sphinx doc