code: function fromIndex(a, index) {
      var arr = is.isArguments(a) ? arraySlice.call(a) : a;
      return arraySlice.call(arr, index, arr.length);
  }
docs: Return the items in between the passed in index
  and the end of the array.
  
  Luc.Array.fromIndex([1,2,3,4,5], 1)
  >[2, 3, 4, 5]
  
  @param  {Array/arguments} arr
  @param  {Number} index
  @return {Array} the new array.