Upgrade jqmodal to a newer version.

The old version didn’t work with jQuery 1.9 as this is now the default with the upgrade to Sakai 10.
jQuery upgrade means live() doesn’t work any more.

We’ve switched from using live() to on() for attaching events.
When there isn’t a good URL in the feed fallback.

Newly released podcasts don’t have good feed URLs to fallback to the default placeholder images when that’s the case.
Browser detection isn’t supported any more.

The MouseDown tracking worked in Chrome anyway so just limiting it to Firefox wasn’t sensible. The new hack for IE is to detect mouse move events once scrolling has finished and assume this to be a mouseup.
WL-3068 Use feature detection instead of browser.

Just check to see if ActiveXObject is present which it should be in IE.
Merge pull request #33 from ox-it/WL-3440

WL-3440 Fix podcast picker to work with Sakai 10.