Rewrote JsBus in CoffeeScript

Changed from JavaScript to CoffeeScript, mainly as an experiment.
Added compile options to Rakefile. Source is located in /src
(obviously). The original (+whitespace, +comments) was 130 lines. The
CoffeeScript version of the same code is less than 100 lines, and
doesn't have nearly same amount of JavaScript 'junk'.
version bump to 0.1.2