Add touch info to gaBrowserSniffer service
Add class 'touch' on body element for touch devices

This will be used to disable buggy touch features like the zoomslider.
Hide zoomslider on touch devices and adapt css
Completely remove zoomslider on touch devices
Refactor style with less variables and mixins

so that we are more robust.
Merge pull request #509 from geoadmin/dev_remove_zoomslider_touch

Remove zoomslider entirely on touch devices