redding/sanford — pull request #100 by kellyredding (2014-06-09 18:48:42+00:00)
Title: configure template sources

This updates the config API to allow configuring template sources.
This is part of the effort to add a render pipeline to Sanford. To
render a template, it needs to exist in a configured source.

Note, this involved changing the config proxy to a class instance
implementation. This instance will track the sources. I also updated
the configs tests to work accordingly and made them more robust.

Related to #85.

@jcredding ready for review.