Make runtime less global for Codec

* Make Codec separate from Scheme
* Move EncodeOrDie off Scheme to take a Codec
* Make Copy work without a Codec
* Create a "latest" package that imports all versions and
  sets global defaults for "most recent encoding"
  * v1beta1 is the current "latest", v1beta2 exists
  * Kill DefaultCodec, replace it with "latest.Codec"
  * This updates the client and etcd to store the latest known version
* EmbeddedObject is per schema and per package now
* Move runtime.DefaultScheme to api.Scheme
* Split out WatchEvent since it's not an API object today, treat it
like a special object in api
* Kill DefaultResourceVersioner, instead place it on "latest" (as the
  package that understands all packages)
* Move objDiff to runtime.ObjectDiff

cmd/integration/integration.go

@@ -29,6 +29,7 @@ import (
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/controller"
@@ -206,7 +207,7 @@ func runAtomicPutTest(c *client.Client) {
 	var svc api.Service
 	err := c.Post().Path("services").Body(
 		&api.Service{
-			JSONBase: api.JSONBase{ID: "atomicservice", APIVersion: "v1beta1"},
+			JSONBase: api.JSONBase{ID: "atomicservice", APIVersion: latest.Version},
 			Port:     12345,
 			Labels: map[string]string{
 				"name": "atomicService",