Image upload is working; it is set to save files into a "images folder" within the install folder. You can view the contents of this file to obtain all the CSS and JavaScript files for the demo. Image upload requires a php file to process the upload; view a .txt version as upload.php.txt. I have not yet gotten the function to save editor contents to work yet using Ajax, still dabbling. The demo is working with a live, demo MySQL table.
Play nice; if you don't your IP will be blocked. The demo gets cleansed regularly meaning that spam will be wasted.
Reference: https://github.com/2braincells2go/summernote-image-upload