Configured for deployment of NumPy, SciPy, and others.

Due to the build-time dependencies of SciPy, the fabfile now supports
a build-deps.txt requirements file.

NumPy being built ith OpenBLAS. Uncertain if there are pros/cons to
this choice.

Now installing the Python modules used for Celery and other
backend-specific stuff (though Celery's web console (flower) pulls in
Tornado and other front-end like stuff.

Also tweaked some of the steps in the run playbook... more work still
to do here.
Deploy Nginx and conf file with Ansible provisioning.

No longer deletes entire deployment directory (to avoid killing log
files).
Removed simplejson module in favor of json module.

We're targeting Python >= 2.7, so we should use the standard library
modules.
Build Circus into the target directory and deploy the application itself

At this point, the application seems mostly up-and-running.