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 simple XML example based on an export from Studio. 

On Oct 24, 2014, at 10:16 AM, Carson Gee <notifications@github.com> wrote:

> In README.rst:
> 
> > ++----------------+--------------------------------------------------------------------------+
> > +| display_name   | The name appears in the horizontal navigation at the top of the page     |
> > ++----------------+--------------------------------------------------------------------------+
> > +| Maximum Score  | Maximum grade score given to assignment by staff                         |
> > ++----------------+--------------------------------------------------------------------------+
> > +| Problem Weight | Defines the number of points each problem is worth.                      |
> > ++----------------+--------------------------------------------------------------------------+
> > +
> > +.. figure:: https://raw.githubusercontent.com/mitodl/edx-sga/screenshots/img/screenshot-studio-new-unit.png
> > +   :alt: image
> > + 
> > +       
> > +Course Authoring in XML
> > +=======================
> > + 
> > +   TBD
> I think we could probably just through a quick example we get from an export here and that would be suitable for most XML authors I would think.
> 
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