Added dnspython to setup.py, removed novaclient version requirement.

Fixed sullivan headnode script to be tukey_headnode.sh
better help message
Merge pull request #1 from allisonheath/master

Small fixes
Merge pull request #2 from mtgreenway/use_auth_token

Use auth token
Merge pull request #3 from mtgreenway/get_cluster_id

Get cluster
Merge branch 'master' of github.com:porterjamesj/novacluster