Adds Dependency Installer to Fabfile

This adds a rudementary (and as of this commit, untested) function to
the fabfile that installs project dependencies that are needed from
aptitude, ruby, node, and python. It also creates and starts the python
virtualenv before installing the python dependencies so that they are
not installed globally.

This needs to be tested, tweeked, and then probably moved over to puppet
or salt stack altogether. But this is a quick hack that will serve our
purposes for now. And the virtualenv command should probably check to
see if the env folder has been created before it initializes the new
environment.