Use fixed delay instead of fixed rate

This seems safer in case full GC or other system slows down system and
backlogs the scheduled commands.
Continue re-capturing stuck threads at interval
GC Events, navbar changes and related refactoring
MBeans
Upgrade to checker framework 1.8.1
TEMP SAUCE LABS ON TRASK/GLOWROOT
Reduce memory footprint of ParsedTypeCache
Rename adhoc pointcuts

... to just pointcuts.
Gauges
Update dependencies