Add Docker/Fig support.

A docker / fig.sh experiment for development environment. It will create a `mysql`, an `elasticsearch` and finally the `mozillians` containers will everything needed to run mozillians.

You can still work "locally" as the mozillians repository is linked to the container.
 
To install:
 * Follow docker installation instructions http://docs.docker.com/installation/#installation
   - probably a `apt-get install docker.io` should be enough
 * Install fig `pip install fig`
 * Copy `mozillians/settings/local.py-docker-dist` to `mozillians/settings/local.py`
 * Run `fig web run ./manage.py syncdb --migrate`
 * Run `fig up`

First `fig` run should take a while, after that it should be really fast.

What do you think @akatsoulas @johngian?