Fix for embedded images
Fix for embedded images

Running a regEx on embedded images'urls like this one: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" is :
- useless since they will not be zommed,
- problematic when base64 encoded string of the image is thousands of characters long : in such case regEx can cost dozen of seconds to evaluate, causing browser freeze (#715).

So they must be filtered out (this applies to regular & background images)

extesy/hoverzoom,extesy/hoverzoom