Closure watcher updates:
Closure watcher updates:

- On first boot, compile a group only if source files are newer than output file (or if no output file is found).
- Correct gzip output. Previously it would always report "2b".
- If a group in setup.json is called "exclude", ignore it.
potench/shum-harden,potench/shum-harden,potench/shum-harden,potench/shum-harden