twerk gallery examples to stay at 400px or less for proper retinafying

docs/assets/css/docs.css

@@ -523,7 +523,8 @@ input.focused {
 -------------------------------------------------- */
 
 .bs-docs-gallery .thumbnail {
-  margin-bottom: 20px;
+  max-width: 400px;
+  margin: 0 auto 20px;
 }
 
 

docs/index.html

@@ -49,7 +49,7 @@ title: Bootstrap
 
     <h1>Built with Bootstrap.</h1>
     <p class="marketing-byline">For more sites built with Bootstrap, <a href="./gallery.html">visit the gallery</a> or <a href="./getting-started.html#examples">browse the examples</a>.</p>
-    <div class="row example-sites">
+    <div class="row bs-docs-gallery">
       <div class="span3">
         <a class="thumbnail" href="http://delicious.com">
           <img src="assets/img/example-sites/example-delicious.jpg">