[Devel] New documentation about automated testing

[Asheesh Laroia]

While at the PyCon sprints, I helped Jairo write some tests for a patch he 
was submitted.

This led me to write up a (partial) guide on testing within the OpenHatch 
codebase: http://openhatch.org/wiki/Automated_testing

Please read it, edit, and/or tell me what you think!

-- Asheesh.

-- 
Grief can take care of itself; but to get the full value of a joy you must
have somebody to divide it with.
 		-- Mark Twain