HTTPS content security warning for CSS in IE7

[markhealey]

From Anders R:

In _loadApps here’s the new code I added to fix the issue.

// load styles
var stylesFragment = null;
var useCreateStyleSheet = !!document.createStyleSheet;
jQuery.each(styles, function(i, e) {
        if (useCreateStyleSheet) {
                document.createStyleSheet(e); 
        } else {
                stylesFragment = stylesFragment || [];
                stylesFragment.push('<link rel="stylesheet" type="text/css" href="' + e + '"/>');
        }
});

if (stylesFragment) {
        jQuery('head').append(stylesFragment.join('')); //this causes ie7 to show security message. fix using document.createStyleSheet }

IE7 is not included in F2's official browser support, however, this change appears to be minor therefore I feel F2 should address it.

[zackferraro]

This also fixes the same problem in IE8, which F2 does support.