IE9 iframe problems. Commit fix.

I was having problems with Lightbox iframes under IE9. Not only the lightbox but the top page would randomly change layout when moving the mouse. As this didn´t happen with Developer Tools open it was really hard to debug.
respondjs doesn´t apply to IE9 (IE8 and below) but I ended up finding the solution in their git page.

Internet Explorer 9 supports css3 media queries, but not within frames when the CSS containing the media query is in an external file (this appears to be a bug in IE9 — see https://stackoverflow.com/questions/10316247/media-queries-fail-inside-i...). See this commit for a fix if you're having this problem. https://github.com/NewSignature/Respond/commit/1c86c66075f0a2099451eb426...

Apparently it´s a IE9 bug. That fork solves the issue by applying respond also to IE9 when in an iframe.

Internet Explorer 9 supports css3 media queries, but not within frames
(this appears to be a bug in IE9). Modifying this script to check for
IE9 and check if within iframe and run if true.

- if( respond.mediaQueriesSupported ){ return; }
+ if( respond.mediaQueriesSupported && !isIE9iframe() ){ return; }

Substituting respond.min.js (libraries) with the file in that commit solves the iframe issue.

I made a patch to change the download URL to point to that branch instead of the master. It also changes the included respond.min.js file in the module´s /lib directory.