allow kubectl cmd to process dirs recursively

reqs:
    - the kubectl cmd must support the -f | --filename flag
    - the kubectl cmd must support visiting a dir one level deep,
    or using more than one resource

docs/user-guide/kubectl/kubectl_expose.md

@@ -95,6 +95,7 @@ kubectl expose deployment nginx --port=80 --target-port=8000
       --port="": The port that the service should serve on. Copied from the resource being exposed, if unspecified
       --protocol="TCP": The network protocol for the service to be created. Default is 'tcp'.
       --record[=false]: Record current kubectl command in the resource annotation.
+  -R, --recursive[=false]: If true, process directory recursively.
       --save-config[=false]: If true, the configuration of current object will be saved in its annotation. This is useful when you want to perform kubectl apply on this object in the future.
       --selector="": A label selector to use for this service. Only equality-based selector requirements are supported. If empty (the default) infer the selector from the replication controller or replica set.
       --session-affinity="": If non-empty, set the session affinity for the service to this; legal values: 'None', 'ClientIP'
@@ -137,7 +138,7 @@ kubectl expose deployment nginx --port=80 --target-port=8000
 
 * [kubectl](kubectl.md)	 - kubectl controls the Kubernetes cluster manager
 
-###### Auto generated by spf13/cobra on 22-Mar-2016
+###### Auto generated by spf13/cobra on 28-Mar-2016
 
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