Update randomness.litcoffee for new node-random version

I was reading through the dependents on `node-random` on npm, and while looking through this project, I noticed that you had discovered a bug concerning random.integers (et al.) returning arrays of strings instead of arrays of numbers (the intended result).  I have fixed this in the latest version of `node-random` (0.0.3), so now you can remove the coercion from your code.