Add a _test service

This service will make an HTTP call to ourself (the new /random.txt
path) if the value is "random."
Add some HTTP caching headers
Rename generic to noop

This is more descriptive
Tweak test service

Add a 2 second sleep and trim the value.
First pass at "always fresh" algorithm

This refreshes transforms asynchronously after the first one. Stale
buttons for stale projects, fresh buttons for fresh projects.