Add fork me on github gibbon

public/css/vroom.css

@@ -103,10 +103,19 @@
   text-align: center;
 }
 #navBarLogo {
-  padding-top: 5px;
+  padding-top: 2px;
 }
 #toolBar {
   padding-top: 35px;
+  margin-right: 90px;
+}
+#forkMeRibbon {
+  position: absolute;
+  top: 0;
+  right: 0;
+  border: 0;
+  width: 149px;
+  height: 149px;
 }
 @media screen and (max-width: 480px) {
   body {

templates/default/public_toolbar.html.ep

@@ -1,4 +1,7 @@
   <nav class="navbar navbar-default" role="navigation">
+    <a href="https://github.com/dani/vroom">
+      <img id="forkMeRibbon" src="/img/fork_me_on_gh.png" alt="Fork me on GitHub">
+    </a>
     <div class="container-fluid">
       <div class="navbar-header">
         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#toolBar">