This is the plugin what I am looking for but I have some trouble using it. I am trying to integrate your plugin to the child theme I created. These are the steps I made.
1. I copied the plugin folder to the child theme folder.
2. In functions.php I made a code like this
3. I have set the Custom Taxonomy in the WordPress settings->Taxonomy Images
The issue is, I can't associate the image. It is not working and it looks different. Seemed that some of the library won't load. This is the screenshot http://screencast.com/t/Xydqgp70RC. The associate button doesn't work http://screencast.com/t/J7OrBrt2bsR. I already cleared my cache.