Add script example for node operation.

Thanks @skyriter for picking this up.
The only examples we have right now are Test and so they are prefixed as such.

This one should be prefixed with Example ... something like /src/cbo_scripts/ExampleProcessNodeContent.php

My thinking is that inside /src/cbo_scripts we will either have Tests or Examples. The main difference being that Tests can be expected to run harmlessly, and Examples should never be run.