fix README.org filename in metadata.rb
change localrc handling

- now node[:devstack][:localrc] (defined in attributes/localrc.rb) is used
  to create the localrc file
- sensible defaults are taken from sebastien han:
  http://www.sebastien-han.fr/blog/2013/08/16/best-localrc-for-devstack/
don't enable q-vpn by default
allow both `true` (Ruby) and "True" (String)

in `node[:devstack][:localrc]`.
make attribute changes backward-compatible
include Vagrantfile (and Berksfile)

...thereby prodiving some "example usage"
Allow for overriding `stack_user`
add .chefignore
depend on `apt`, don't support non-debian-ish OSes
remove artifact, add note about logging in Vagrant
indentation
authors+=me ;)