tarcieri/timers — pull request #4 by funny-falcon (2012-08-13 13:32:22+00:00)
Title: Use RBTree directly instead of SortedSet (which is wrapper to rbtree in best case)

SortedSet uses rbtree when available, but fallsback to slow implementation
when rbtree is not available.
Use rbtree directly to ensure stable performance.