Format block-comments better

This is probably not a big deal, but I just don't like the way this works:

```coffee
###
# This is a block comment, with important details!
###
```

Outputs to

```js
/*
# This is a block comment, with important details!
*/
```

I feel like it would be better to format block comments more like
```js
/*
 * This is a block comment, with important details!
 */
```

I don't think this would be terribly difficult to implement - so I might take a stab at it. The only reason it bothers me is because it looks so unclean and weird.

So, I dunno, is it worth taking a stab at?