[CodeWras] xD-Arrays for dimmies

xD-Arrays for dimmies

http://www.codewars.com/kata/5402724fd39b43c075000116/train/javascript

```javascript
function fill(n, x) {
   var a = [];
   for(var i=0;i<n;i++) {
     if (typeof x === 'function') a[i] = x();
     else if(x instanceof Array) a[i] = x.slice(0);
     else a[i] = x;
   }
   return a;
}

function dim(...a) {
  console.log(a)
  if (a.length == 2) return fill(a[0], a[1]);
	else if (a.length == 3) return fill(a[0], fill(a[1], a[2]));
	else if (a.length > 3) return fill(a[0], dim.apply(null, a.slice(1)));
	else return '';
}
```