Add id tag to .zoomContainer

[appfeel]

It adds {image#id}-zoomContainer id to the new .zoomContainer elements. It allows to completely remove an elevateZoom associated to an image with id tag, by selecting the zoomContainer associated to an image with the id selector. This is crucial for multi elevateZoom images in carousels, where the image moves and the zoomContainer was covering elements on the page.