CSS optimizations are conservative in the presence of extra attributes

[GoogleCodeExporter]

What is the expected output?   All CSS combined or cache-extended
What do you see instead?  Some CSS files are left unoptimized
What version of the product are you using:  X-Mod-Pagespeed 0.9.8.1-215
Which version of Apache?  Apache/2.2.3 (CentOS),  X-Powered-By  PHP/5.1.6
Please provide any additional information below, especially a URL or an
HTML file that exhibits the problem.

http://www.cloudtech.org/

These links are not optimized because mod_pagespeed ignores any 'link' tags 
with unexpected attributes.  It should just leave them alone -- actually 
CSS-combining should probably *not* combine CSS links with distinct IDs.  
However that should not prevent cache extension.

<link rel='stylesheet' id='codecolorer-css' 
href='http://www.cloudtech.org/wp-content/plugins/codecolorer/codecolorer.css?ve
r=0.9.8' type='text/css' media='screen'/>
<link rel='stylesheet' id='wp_dlmp_styles-css' 
href='http://www.cloudtech.org/wp-content/plugins/download-monitor/page-addon/st
yles.css?ver=3.0.1' type='text/css' media='all'/>

Original issue reported on code.google.com by jmara...@google.com on 20 Nov 2010 at 1:50