See https://gist.githubusercontent.com/textarcana/5737478/raw/e255fdc9e896507210406d9641ed9e3469324a6b/array-permutation.js
/*jslint sloppy:true, white:true, vars:true, plusplus:true */
var permutation = function (collection){
var current,
subarray,
result = [],
currentArray = [],
newResultArray = [];