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 changed all the settings file paths to be root relative.

On Oct 24, 2014, at 10:12 AM, Brandon DeRosier <notifications@github.com> wrote:

> In README.rst:
> 
> >     -  ``pip install -e git+https://github.com/mitodl/edx-sga@release#egg=edx-sga``
> >  
> > -3. Add edx\_sga to INSTALLED\_APPS in Django settings. Enable an XBlock
> > -   for testing in your devstack.
> > +   in production:
> > +	
> > +   - add to requirements file
> Just to lower the bar a little, we might want to specify that it needs to be added to /edx/app/edxapp/edx-platform/requirements/edx/github.txt, and maybe explicitly say that -e git+https://github.com/mitodl/edx-sga@release#egg=edx-sga is what needs to be added.
> 
> Maybe a short note being more specific about production would be good, i.e., explaining that you should do this on a branch you've made in a forked edx-platform repo for your org.
> 
> —
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