IcedCoffeeScript: Run CoffeeLint

More fixed for #1291.
Yes, and `All()` short-circuits on the first `false`.

I meant that we should ideally not bail out if there are some CoffeeScript buffers and some LiveScript buffers (bail if they're all LiveScript or not CoffeeScript at all).
However, since it wouldn't work anyway, it's not worth changing.