[wip] Rackspace CLBs

Addresses #289. Milestones are:

- [ ] LBs
- [ ] error pages
- [ ] LB stats
- [ ] nodes
- [ ] VIPs
- [ ] domains
- [ ] usage reports
- [ ] access lists
- [ ] monitors
- [ ] session persistence
- [ ] connection logging
- [ ] throttling
- [ ] caching
- [ ] protocols
- [ ] algorithms
- [ ] SSL termination
- [ ] metadata

(Not sure if all of these resources will make it into this PR)