Rackspace CLBs

Addresses #289. Milestones are:

- [x] LBs
- [x] error pages
- [x] LB stats
- [x] nodes
- [x] VIPs
- [ ] domains
- [ ] usage reports
- [x] access lists
- [x] monitors
- [x] session persistence
- [x] connection logging
- [x] throttling
- [ ] caching
- [x] protocols
- [x] algorithms
- [x] SSL termination
- [ ] metadata

(Not sure if all of these resources will make it into this PR)
They're always just `int`s. AFAIK `int64`'s upper range is 9,223,372,036,854,775,807 (nine quintillion). `int` guarantees 32 bits (2,147,483,647); I don't think our CLBs will exceed that IMHO