Register okpy on pip DO NOT MERGE

This PR currently just creates the setup.py file necessary for registering ok.py on pip. I haven't actually registered yet.

A couple of things to note:
* The name `ok` is taken on `pip`, so I named our package `okpy`. Let me know if you have other suggestions
* I'll register the first version at v1.0.6, since that's what our current release version is.

For now, you can play around in dev mode with the following command (from the root of the repo, and make sure you `source activate_client.sh` first):

    python setup.py develop

This creates a command-line utility called `ok`. I plan to add more command-line utilities, after the publishing PR is meged.