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
I added a sentence about how changing file storage affects the comments application. 

On Oct 24, 2014, at 10:06 AM, Carson Gee <notifications@github.com> wrote:

> In README.rst:
> 
> >  
> >        to
> >  
> >        .. code:: sh
> >  
> > -          ‘ALLOW_ALL_ADVANCED_COMPONENTS’: True,
> > -
> > -4. Log in to studio (with VM running).
> > -
> > -   1. Login
> > +          'ALLOW_ALL_ADVANCED_COMPONENTS': True,
> > +          
> > +3. Configure file storage
> > +
> > +   devstack defaults to local storage, but fullstack defaults to S3. You have 
> > +   two options in fullstack:
> We should also mention that this setting affects uploads for many parts of the platform, most notably forum image uploads.
> 
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