Merge pull request #432 from adityab/eventtrap-clickungrab

Do not grab click events on the eventTrap.
Update link to demos in README.md
Merge pull request #434 from kossebau/updateDemosLink

Update link to demos in README.md
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.

**More description to come**
Fix the post-gesture zoom correction
so that it correctly resets the scroll
and also change the float style of
the sizer so the browser knows to update
the scrollbar sizes