Make cookbook work with nova attributes
Remove all non-cookbook files

We do not use a split role/proposal anymore for Hyper-V: this is now
part of the nova barclamp.

We obviously keep crowbar.yml so that this is still installable as a
barclamp.
Do not declare the barclamp as member of the openstack group

Otherwise, it appears in the list of barclamps.
Merge pull request #5 from vuntz/nova-attributes

Move to use a role in the nova barclamp for Hyper-V