Sphinx sass updates for sidebar, images, autodoc api

![sphinx-rtd-branch-api](https://f.cloud.github.com/assets/26336/1462489/74435e02-44fa-11e3-8d22-b50a60e4ddce.png)
![sphinx-rtd-branch-examples](https://f.cloud.github.com/assets/26336/1462490/745e9b18-44fa-11e3-9255-3050e3b8f48f.png)