Newsletters HTML editor, Modal confirmation, CDN images

- Modal confirmation replace with something better open-classifieds/openclassifieds2#963
- CDN images open-classifieds/openclassifieds2#961
- Fixes newsletters editor usage of HTML editor not BBCODE open-classifieds/openclassifieds2#981
makes sense. Lets concatenate the date of the update.  In ads we have "published" but we will need an extra field called updated. So every time they modify anything on the ad we modify the update date. Then we can concatenate it like a time stamp in unix seconds ?v=134345234. For location, categories and users we need same field, sucks and more extra work, but is worth it I think. Also in categories/locations/users we need a field called has_image? so in case has image we read the image if not we don't do anything.