code: function splice (s, index, count, add) {
                      return s.slice(0, index) + (add || '') + s.slice(index + count);
                  }
docs: Splices a string, much like an array.
  @param {String} s The string to operate on.
  @param {Number} index The index to begin splicing the string at
  @param {Number} count The number of characters to delete
  @param {String} add The string to append at the spliced section
  @return {String} The spliced string.
  @function