steps
virtualenv --system-site-packages venv
source venv/bin/activate
git clone git@github.com:lukasheinrich/recast-rivet-recaster-demo.git
cd recast-rivet-recaster-demo/
pip install -e . --process-dependency-links
cd implementation
celery worker -A recastrivet.general_rivet_backendtasks -l debug -Q rivet_queue