0.5.2_pre2

• Show error on too-large upload to 3ds (not size of image; you should not see this error regardless!)
• Show error on too-large reference image (again not size of uploaded image, just a safety check!)
• Fix text overflow in image upload page
• Change reference image with R + Start + Up/Down

NOTE: Image re-rendering is done browser-side, and there's a stark difference between how firefox does it vs. chrome. Same for derivatives of these browsers