Responsive layout class defaulting to 'mobile' rather than the primary.

Hey folks,

Been having a hell of a time with IE7 and Omega, and I've tracked down one of my biggest issues being that the responsive-layout-xyz class that is getting added isn't the primary (Which is what I'd expect omega to fall back on) but mobile. Tracked it down to the following bit of code in setCurrentLayout, in omega-mediaqueries.js:

current = Drupal.settings.omega.layouts.order.hasOwnProperty(index) ? Drupal.settings.omega.layouts.order[index] : 'mobile';

Changed it to:

current = Drupal.settings.omega.layouts.order.hasOwnProperty(index) ? Drupal.settings.omega.layouts.order[index] : Drupal.settings.omega.layouts.primary;

Maybe I've misunderstood what this function is meant to do, but it seems to me it should always fall back on primary rather than mobile. Attached below is the patch with the above code.