Fix for CoffeeScript 1.7.0

From CoffeeScript 1.7.0 changelog: "Leading . now closes all open calls, allowing for simpler chaining syntax."

Updated CoffeeScript syntax means that '.filter' is applied to result of .plug() instead of syncEvents.
Merge pull request #4 from sveinatle/patch-1

Fix for CoffeeScript 1.7.0