Test proving the existence of #243. With jQuery 1.7.1 up to 1.9.1 in IEs 6 and 7 the "Actually animating" test fails.
With jQuery 1.7.1 up to 1.9.1 IEs 6 and 7 are actually enforcing `src=""` on image nodes without that attribute, causing images to fail being preloaded in these browsers. Fixes #243
Started 1.3.1-devel
Merge branch 'gh-243-old-ie-loading' into development