Add additional meta tags to html to stop zooming

The page as-is can be zoomed with mobile gestures and by tapping on
inputs. This commit should stop that from happening. (This does not
affect zooming of the map).
Merge branch 'master' into issues/mobile-zoom
Autohide leaflet zoom controls on mobile

On mobile devices (with a few exceptions) you can zoom the map using
gestures, so it doesn't make sense to waste screen space with zoom
controls.
Merge pull request #28 from routemaster/issues/mobile-zoom

Improve zooming experience on mobile devices