WIP: Standardize build tools using make

* Add a `Makefile` for running toplevel commands:
    - `make install` installs all dependencies (assuming Ubuntu 12.04)
    - `make test` runs the test suite (both JS and Python)
    - `make` both installs and runs the tests.
* Deprecate custom Vagrantfile in favor of using devstack directly.
* Deprecate some scripts that we don't need anymore (celery workers, benchmark AI, etc.)
* Add wheels for Mac OS X dependencies.  This allows us to use some of the `make install-python` command on OS X, which we need to still support for workbench.
* Update the README

@jarv @stephensanchez