starting a single havana build for development purposes.
provide a listing of CentOS images
Merge branch 'master' of github.com:huit/nepho
Merge branch 'master' of github.com:huit/nepho
refactor user data script snippets into separate files, to simplify management of these scripts.
Merge pull request #56 from robparrott/userdata-script-refactoring

Userdata script refactoring