Many changes to enable the vagrant build/test environment.

* Now uses a private_vars.yml file for secret AWS keys (see
  README.rst).

* Consolidated the Circus and application configuration into a single
  councilroom.ini file.

* Celery configuration now comes from the configuration file instead
  of being hardcoded.

There is still some work to do to enable the background jobs to be
easily kicked off. Right now, you have to login to the Vagrant
instance, su to cr_prod, change to a temp directory where you have
read/write perms, and then invoke::

    CR=/srv/councilroom
    COUNCILROOM_CONFIG=$CR/councilroom.ini PYTHONPATH=$CR/app \
        $CR/cr-venv/bin/python $CR/app/update.py \
        --start-date 2013-08-01 --end-date 2013-08-08