Call out all authors in AUTHORS.md
Merge pull request #29 from celluloid/licensing-and-boilerplate

Call out all authors in AUTHORS.md
Add Timers::Timeout and associated spec.
Refactor the root class Timers into a module for easier composition and additional functionality going forward.
Set the offset that the timer was fired, so that if it was triggered slightly early, it would still work as expected, e.g. #fires_in, #delay, etc.
Removed fudge factor. Too bad, it was pretty tasty.
Updated AUTHORS.md.