Improve update demo, support rolling template update

This improves the update demo pretty dramatically.

* Makes the demo more visual, fixes some HTML layout
* Make naming of objects in `kubecfg run <image> <replicas> <controller>` more obvious
* Run update demo without pushing/creating new containers in docker hub (slow)
* Improve e2e tests to actually do the rolling update
Don't understand why we're stuffing a type into the name label. Type information is stored separately. Don't put two things in one label, anyway.