Proposal for v1beta3 API

* Separate metadata from objects
* Treat lists differently from resources
* Add UID and Annotations on Metadata
* Introduce BoundPod(s) as distinct from Pod to represent pods
  scheduled onto a host
* Use "spec" instead of "state" and "status" instead of "currentState"
  * Identify current status of objects consistently
  * Use "condition" as the string label for substatus
* All string constants should be PublicGoCapitalized
* Rename Minion -> Node
* Rename ServerOp -> Operation
* Remove ContainerManifest
* Add api-conventions.md document
* Replace PodTemplateSpec in ReplCtrl with ObjectReference
Merge pull request #1225 from smarterclayton/v1beta3_proposals

Proposal: v1beta3 API overhaul