Old trick with window.scrollTo(0,1); doesn\'t work. And even worse, the address bar moves only a bit and gets stuck halfway out sometimes.
On iOS 7 you can use the minimal-ui meta tag. Unfortunately, that was removed in iOS 8.
For iOS 8 there's a project called brim that is supposed to bring back the minimal-ui type functionality. It can be found here: https://github.com/gajus/brim