Fast Pinch-Zoom support on the sizer.

This patch adds a new class ZoomHelper that
is used to control the zooming of the document
by API and/or touch gestures. CSS3D transforms
are used to do extremely fast bitmap scaling
of the sizer.
Disable the zoom slider in case touch events are
present.
Show custom scrollbars in touch mode.

This is required because webkit on mobile
does not seem to show any scrollbars if
`-webkit-overflow-scrolling: touch` is not
enabled -- and we cannot enable that because
it's kinetic scrolling is not controllable
or trackable.