Simplify labels for `kubecfg run`

We created a name=<controller name> label on each object we created.  This was confusing.  Instead, piggyback on `replicationController` label and use that as the selector.
Add template update to rollingUpdate
Pretty up the demo a little.

Use images and some better formatting.  Also add scripts to help prevent typos.

This based on an improved version done by Julia Ferraioli.  She came up with the cool images.
Fix/expand kubecfg unit tests
Add containerPort to services in guestbook example
Use KUBECFG instead of CLOUDCFG in scripts
Fix up e2e test for update demo.

Use the scripts that are in the example directory.  Also actually run the update as part of the test.
Improve 'Usage' for kubecfg