Add "max-width: 100%;" to stop large images from overflowing the new rendering engine UI
Add max-width: 100%; to keep them contained.
- Viewed a very wide image in Safari, Firefox and Chrome. Saw sensible rendering.
- Also viewed a normal image, saw normal behavior.
Reviewers: amckinley, avivey
Reviewed By: avivey
Differential Revision: https://secure.phabricator.com/D19457