update the output for functional tests

tests/output/basic/theme/css/main.css

@@ -309,7 +309,10 @@ img.left, figure.left {float: left; margin: 0 2em 2em 0;}
 		.social a[href*='twitter.com'] {background-image: url('../images/icons/twitter.png');}
 		.social a[href*='linkedin.com'] {background-image: url('../images/icons/linkedin.png');}
 		.social a[href*='gitorious.org'] {background-image: url('../images/icons/gitorious.png');}
-        .social a[href*='gittip.com'] {background-image: url('../images/icons/gittip.png');}
+		.social a[href*='github.com'],
+		.social a[href*='git.io'] {background-image: url('../images/icons/github.png');}
+		.social a[href*='gittip.com'] {background-image: url('../images/icons/gittip.png');}
+		.social a[href*='plus.google.com'] {background-image: url('../images/icons/google-plus.png');}
 
 /*
 	About