Implemented LoopInterface::futureTick().
Added futureTick() support to ExtEventLoop.
Added basic next-tick/future-tick example.
StreamSelectLoop was treating seconds as microseconds, outward behavior was correct but internally many short sleeps/select calls were being made.
All loop implementations now complete the current tick with no blocking after stop() is called.
Merge branch 'refs/heads/future-tick'
Updated changelog