BZ 1127297: remove hosts from hostgroup when deleting hostgroups

We were already doing this correctly on deployment delete, but
this commit moves it down one level, so any time we remove a
DeploymentRoleHostgroup, the hosts are removed too -- which
handles layout changes properly.
Merge pull request #260 from sseago/BZ1127297

BZ 1127297: remove hosts from hostgroup when deleting hostgroups
version bump to 0.2.2
Revert "hack to get deployment.ips.controller_ips to work w/ multi-nics"
Merge pull request #262 from theforeman/revert-258-controller-ip-hack

Revert "hack to get deployment.ips.controller_ips to work w/ multi-nics"
BZ 1128460: removed extra cinder_nfs_shares entry from seeder.rb

There was an extra cinder_nfs_shares entry in seeder.rb that overrode
the original value to [], breaking NFS support.
Merge pull request #263 from sseago/BZ1128460

BZ 1128460: removed extra cinder_nfs_shares entry from seeder.rb
bz1128769: fix memory reporting for host list

The hosts list was always taking the memory number and dividing by
1000. This had 2 problems:
1) should have been 24
2) only worked for hosts reported in MB, not for GB, etc.
Merge pull request #264 from sseago/BZ1128460

bz1128769: fix memory reporting for host list
version bump to 0.2.3
Unused hostgroup variable
Assign, Unassign, and Undeploy buttons, and JS.