Fix displaying of large images in thumbnails and image pages for review requests

Review Request #5444 — Created Feb. 9, 2014 and submitted — Latest diff uploaded

Review Board
reviewboard, students

Large images, or images wider than the width of the thumbnail boxes on review request pages were overflowing the size of their bounding boxes. I updated their width to not exceed the parent divs

Tested this on my local server using images from the reviewboard server that overflowed their bounding boxes.