Lodash and decorator function assignments added; revised string delimiter

Lodash: thanks to Tyler for helping me figure out Lodash.

Decorator Function: I kind of have an idea what I'm doing. Kind of not. Comments welcomed (encouraged!).

String Delimiter 2: this version uses a for loop and array.prototype.join instead of slice and indexOf.
countDecorator should accept a parameter that is a function, and will later be your 'add' function.