Update grid helper javascript.
Update grid helper javascript.

It should work for developer's using `script/rails s`, as well as though
using pow.

robinwhittleton/whitehall,robinwhittleton/whitehall,alphagov/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,alphagov/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,ggoral/whitehall,hotvulcan/whitehall,YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,askl56/whitehall,ggoral/whitehall,hotvulcan/whitehall,alphagov/whitehall,askl56/whitehall,askl56/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall