feat(ruleset): Exclude ".min.css" files from the Drupal ruleset (#3269399 by Grevil)

 <exclude-pattern>*/\.svn/*</exclude-pattern>

 <exclude-pattern>*/\.hg/*</exclude-pattern>

 <exclude-pattern>*/\.bzr/*</exclude-pattern>

 <!-- Ignore minified CSS files.-->

 <exclude-pattern>*\.min\.css$</exclude-pattern>

</ruleset>