rebase to kubernetes v0.4.x

- [x] get project to compile against k8s v0.4.x
- [x] need custom controller-manger impl to deal w/ custom endpoint-controller
- [x] review custom endpoint-controller implementation (rebase)
- [x] review kubernetes-executor (main) implementation (rebase)
- [x] review service proxy network connectivity (rebase)
- [x] review namespace implementation (looks like "default" on master, but "etcd" in kubelet?)
- [x] review bindings life cycle, ensure no leakage
- [x] update guestbook example (switch back to stock images instead of jdef/ since `_SERVICE_HOST` env vars are now supported)
- [x] multi-host testing
- [x] continuous "mini load" testing
- [ ] **post-merge:** update jdef/redis-slave to build from master branch