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
Ok. I'm replacing the value of DEFAULT_FILE_STORAGE instead of deleting it. 

Although having tried that myself, I'm still having trouble with file uploads. 

On Oct 24, 2014, at 10:03 AM, Carson Gee <notifications@github.com> wrote:

> In README.rst:
> 
> >        .. code:: sh
> >  
> > -          sudo su edxapp
> > -          paver devstack studio
> > +          del DEFAULT_FILE_STORAGE
> Instead of deleting the var to set it back to default right after it is set, I would suggest telling them to replace the value of DEFAULT_FILE_STORAGE with django.core.files.storage.FileSystemStorage. The MEDIA_ROOT hash is still required and correct
> 
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