This is definitely on our short list and SnapEditor won't go to production without the image uploader. I'm going to guesstimate we'll have some sort of support in about a month along with some other got-to-have features.
We want to get this right and part of that is coming up with a great and simple server API to handle the uploads across all platforms/languages/frameworks.
Do you have an ETA on when you are going to be releasing the image upload front-end function?