Use thumbnails instead of resizing big images
At the moment some page as app_detail
(eg: http://127.0.0.1:8000/softhub/app/1/) show the application icon at its current size (the same size of the uploaded image).
Big images can cause big loading times, so a thumbnail image should be generated on upload and used in the site.
This external app could be useful: https://github.com/mariocesar/sorl-thumbnail/tree/master/sorl/thumbnail