Lightbox: update ColorBox JS 1.3.35 from 27
Lightbox: Update shared CSS

- Adding comments to help future upgrades
- Only difference is -webkit-overflow-scrolling: touch for the loaded
content
Lightbox: Update Example 3 CSS

Diffed the CSS with the new and added comments for the WET changes
Lightbox: Remove unused old/original control image

The version used by WET flips this and changes the directions of the
navigation arrows
Merge pull request #1197 from nschonni/update-colorbox1.3.34

Lightbox: Update ColorBox from 1.3.27 to 1.3.34