Move demos and dev directory into a new contrib directory

README.rst

contrib/demos/heat/README.rst

contrib/demos/heat/launch

contrib/demos/heat/steak-rg.yaml

contrib/demos/heat/steak.yaml

contrib/demos/magnum/redis

contrib/demos/magnum/redis-kube/README.rst

contrib/demos/magnum/redis-kube/redis-controller.yaml

contrib/demos/magnum/redis-kube/redis-master.yaml

contrib/demos/magnum/redis-kube/redis-proxy.yaml

...ib/demos/magnum/redis-kube/redis-sentinel-controller.yaml

contrib/demos/magnum/redis-kube/redis-sentinel-service.yaml

contrib/demos/magnum/start

contrib/demos/magnum/stop

contrib/dev/vagrant/Vagrantfile

contrib/dev/vagrant/Vagrantfile.custom.example

contrib/dev/vagrant/bootstrap.sh

contrib/dev/vagrant/newest_dhcp_lease.py

doc/vagrant-dev-env.rst

tools/loc