Fix the IE8 404 problem for background images.

@6a68 - mind a bit of review?

Add a #iefix to all background-image: url(''s that contain two parts. fixes IE8 404'ing when requesting these images.

For a bit of background, see http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax.

They use ?#iefix syntax, but the ? is unnecessary.

fixes #1736