Button in Primefaces doesn't render icones from its external css in background-image.

What steps will reproduce the problem?
1. I configure granule for JSF as issue 10;
2. I merge two external css with success because a see the merged file in Web 
Inspector in Opera;
3. The xhtml recognize the merged css, except the background-image. The 
<p:button> (I use primefaces) doesn't renders that image.

Original issue reported on code.google.com by kurama.m...@gmail.com on 11 Dec 2014 at 8:15

laxman954 / granule

Button in Primefaces doesn't render icones from its external css in background-image. #28