tinymce4 rails upload solution?

TinyMCE4 is quite different. Minus inserting images, I'm ready for the push to product. I had a simple plugin for inserting images but tinymce_popup.js is gone and I'm not sure how to rewrite it so the authtoken and attacment owner variables are populated.

If anyone knows a Rails 3.1+ TinyMCE4 upload solution, please share it!
