Avoid the need for utile.args(arguments).array by using Object.defineProperty

[indexzero]

Discussed this with @Marak over gchat the other day and decided to implement it.

imho we should be optimizing for the simple case where someone simply wants to call Array.prototype.slice.call(arguments). Check the diff on the tests for all the details of what's changing.

Usage:

  function getArgs() {
    //
    // [ 'a', 'b', 'c' ]
    //
    console.dir(utile.args(arguments));

    //
    // All additional properties not enumerable.
    // e.g. 
    //

    //
    // function ok() { console.log('ok');
    //
    console.dir(utile.args(arguments).cb.toString());
  }