Api test for adding a app

I used zalun's pip plugin:
http://pypi.python.org/pypi/Marketplace/0.1.3a

Here is the repo:
https://github.com/mozilla/Marketplace.Python

Also here is the API documentation:
https://github.com/mozilla/zamboni/blob/master/docs/topics/api.rst

We still need to wait for the delete app feature but we at least have a good start.
https://bugzilla.mozilla.org/show_bug.cgi?id=816572

I ask you all to review my code and add enchantments to it.