lean up Vagrant provisioning, upgrade to Python3, and add Celery task for Lastfm API search
- Use trusty64 box
- Replace bashrc with box default
- Upgrade Postgres to 9.3
- Upgrade Django to 1.6.5
- Remove unused dependencies:
-- libjpeg-dev
-- libtiff-dev
-- zlib1g-dev
-- libfreetype6-dev
-- liblcms2-dev
-- git
-- django-compressor
-- django-debug-toolbar
-- gunicorn
-- Fabric