Added pelicanconf.local.py.
This file has settings that make sense in a local dev environment
such as:

RELATIVE_URLS = True
No feeds
No sitemap

This is the conf file to referenc when developing locally

$pelican --settings pelicanconf.local.py -r

Added pelicanconf.testing.py
This is the same exact file as pelicanconf.py except that:

SITEURL = '//testing.gimp.org'

So that URL's will build correctly.