Pdpinch/documentation updates

WIP. Not ready to merge yet. 

@cgee or @bdero can you review the installation instructions, esp. part 3:

https://github.com/mitodl/edx-sga/blob/pdpinch/documentation-updates/README.rst#installation
Thanks. I didn't know how to do that in rst, but I much prefer H2 for subsections. I changed them all. 

On Oct 24, 2014, at 10:24 AM, Brandon DeRosier <notifications@github.com> wrote:

> In README.rst:
> 
> >  
> > -1. `edX Developer Stack
> > -   Installation <https://github.com/edx/configuration/wiki/edX-Developer-Stack>`__:
> > -   Install Vagrant, Pip, & VirtualBox
> > +Installation
> > +============
> Could you use h2 headers for these subsections ("Installation", "Course Authoring in edX Studio", etc)? (------------------ instead of ==================)
> 
> —
> Reply to this email directly or view it on GitHub.
>