Starting PandExo Releases

Working towards more official ways to do PandExo releases (dev branche, builds with travis-ci, tested conda builds, etc).

Trying to work towards automatic conda builds with travis-ci but am running into some Pandeia bottlenecks. For now there is a py3.6 build on my channel:

conda install -c natashabatalha pandexo.engine

But you will have to install these separately:

pip install pandeia.engine batman-package

From now on, requests for small changes will be added to dev and new PyPi or conda builds will occur less frequently