- use canvas drawing functions instead of divs for markers (wip)
- use forEach for big arrays (eg: saved markers) instead of bugged $.each
- redraw image natively only when area changed (zoom, scroll, ...)
- updateCanvas() instead of updateMarkers()
- updateMarkers is now a method of image_navigator
- fix interpolation (scrollLeft/scrollTop are not integers)
- bind resize event to window instead of document
- fix image_navigator callback
- setup and update buttons per panel
- display zoom level