Link type attribute erroneously removed for RSS feeds

This module removes the type attribute for all link tags. While it is the correct behavior for stylesheets, the type attribute must be there when type="application/rss+xml" in order for RSS feeds to function correctly (for the RSS icon to be displayed in the address bar in Safari for example). The attached patch (against 7.x-1.1, but the problem seems to remain in dev) makes sure the type attribute is only removed when rel="stylesheet".