Removed goroutine (superseded by Future)
YARD documentation for TimerTask and Concurrent::Timeout.
Better documentation for Event and Conxurrent::timeout
Added note about semantic versioning to README
Fixed minor bug in Event#reset
Postable message methods now raise exception when given an empty message
Better YARD documentation.
Fixed bug when TimerTask given non-integer interval values.
Stoppable mixin allows TimerTask to run block on stop.
Merged latest master