Register okpy on pip

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.
* Do we have an official email we want to list? `pip` warns that, if the `author` field is present in `setup.py`, then `author_email` should be present as well.

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.