TODO
Speedtracer Resymbolization: seems like it would be possible to get Speedtracer to pull up the Ruby code that was slow... ????
Speedtracer call tagging: right now we just say "everything is either HTTP or METHOD" - maybe more accurate tagging would be useful.
Config: panels in required files automatically turned on - explicit exclude?
Config: Explore other parts that may benefit from a config option.
UUID: Allow re-use of the Rails UUID set in middleware. How?