Add support for --rollback.

docs/kubectl_rolling-update.md

@@ -45,6 +45,7 @@ $ kubectl rolling-update frontend --image=image:v2
   -o, --output="": Output format. One of: json|yaml|template|templatefile.
       --output-version="": Output the formatted object with the given version (default api-version).
       --poll-interval="3s": Time delay between polling controller status after update. Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+      --rollback=false: If true, this is a request to abort an existing rollout that is partially rolled out. It effectively reverses current and next and runs a rollout
   -t, --template="": Template string or path to template file to use when -o=template or -o=templatefile.  The template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview]
       --timeout="5m0s": Max time to wait for a controller to update before giving up. Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
       --update-period="1m0s": Time to wait between updating pods. Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
@@ -83,4 +84,4 @@ $ kubectl rolling-update frontend --image=image:v2
 ### SEE ALSO
 * [kubectl](kubectl.md)	 - kubectl controls the Kubernetes cluster manager
 
-###### Auto generated by spf13/cobra at 2015-04-29 15:25:11.031878187 +0000 UTC
+###### Auto generated by spf13/cobra at 2015-05-02 00:22:29.503205238 +0000 UTC