Pull from GitHub downloads for latest v3-wip on homepage

/cc @cv

assets/css/docs.css

@@ -124,7 +124,7 @@ body {
 /* Download button */
 .bs-masthead .btn-outline {
   margin-top: 20px;
-  margin-bottom: 5px;
+  margin-bottom: 20px;
   padding: 18px 24px;
   font-size: 21px;
 }

index.html

@@ -8,9 +8,9 @@ base_url: "./"
   <div class="container">
     <h1>Bootstrap 3</h1>
     <p class="lead">Sleek, intuitive, and powerful mobile-first front-end framework for faster and easier web development.</p>
-    <p><strong>Heads up!</strong> Until the final v3 is released, downloads may be behind the development branch and Bower package.</p>
     <p>
-      <a href="{{ site.download_dist }}" class="btn btn-outline btn-lg" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'Download', 'Download 3.0.0 RC1']);">Download Bootstrap</a>
+      <a href="{{ site.download }}" class="btn btn-outline btn-lg" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'Download', 'Download 3.0.0 RC1']);">Download latest BS3</a>
     </p>
+    <p><strong>Heads up!</strong> Downloads are pulled directly from the latest commited code on GitHub, and as a result our docs may at times be out of sync.</p>
   </div>
 </div>