Image upload with sidebar

Hey Elliot, 

This pull request is in reference to: http://support.advancedcustomfields.com/forums/topic/sidebar-with-single-image-upload/#post-3477

We've had our dev take a look at this and he was able to get the sidebar too appear on the individual image upload. We'd appreciate if you could roll this into the production branch so we can keep the plugin up to date. 

Thanks.