hack in vagrantfile from omni-chef to build openstack stuffs

this adds the vagrantfile from openstack-chef but running omni-openstack
:)
add gitignore for bundle/vagrant chaff
update readme with vagrant info
Merge pull request #1 from spheromak/vagrant

Vagrant
Removing cruft from Vagrantfile

For right now I will be concentrating on Ubuntu builds as those seem to
be the most widely supported. Therefore, for the sake of simplicity, I
have updated the Vagrantfile to remove things like freebsd and smartos
as well as all platforms other than 12.04 LTS. This will get augmented
in a future iteration - at this point this is still somewhat of a proof
of concept.
tell berks about cookbook-omnibus
user lates omnibus-openstack and omnibus-software gems