support r3 instances & expose virtualization type
[rackspace|autoscale] call clear on collection if group has not been persisted in order to prevent fog from lazy loading non-existent collections
[rackspace|autoscale] updating getting started docs
Merge pull request #2975 from engineyard/r3

support r3 instances & expose virtualization type
[rackspace|autoscale] fixing broken tests
Merge pull request #2978 from rackspace/autoscale_fix

[rackspace|autoscale] Updated to support creating groups without policies