Miniconda based AppVeyor Python CI

This is a branch of the AppVeyor Demo which uses [Miniconda](http://conda.pydata.org/miniconda.html) to provide the Python build environment.  This would allow the installation of conda packages to provide build dependencies.  Python 2.7 and 3.4 are support, both 32 and 64-bit version. 
[Example results](https://ci.appveyor.com/project/JonathanHelmus/python-appveyor-demo/build/1.0.9)

I would not suggest merging this into master, rather if something like this is desired merge into a new branch.  Unfortunately GitHub does not allow pull request into a branch that does not exist in upstream.

Thanks for the demo, it has been very helpful!