Add performance metrics to tasks and node#248

Merged

nathanielc merged 5 commits intomasterfrom nc-issue#215

Feb 24, 2016

+1,522-387

Commits on Feb 22, 2016

Commits on Feb 23, 2016

expvar refactored to allow getting and deleting
nathanielc
committed
fixes #114 bad union implementation, now works even with buffered edges
nathanielc
committed

Commits on Feb 24, 2016

add flag for labels
nathanielc
committed