Abstract css colours on login page to colors-fresh. Fixes #6135 props iammattthomas.

git-svn-id: http://svn.automattic.com/wordpress/trunk@7187 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-login.php

@@ -14,6 +14,9 @@ function login_header($title = 'Login', $message = '', $wp_error = '') {
 	<title><?php bloginfo('name'); ?> &rsaquo; <?php echo $title; ?></title>
 	<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
 	<link rel='stylesheet' href='wp-admin/css/login.css' type='text/css' />
+	<?php
+	wp_admin_css( 'css/colors-fresh' );
+	?>
 	<script type="text/javascript">
 		function focusit() {
 			document.getElementById('user_login').focus();