put git ribbon on bottom-right

page.html

     <!--%
         if page.get("github", "") != "":
             # GitHub Fork-Me Ribbon
-            print '<div class="github-fork-ribbon-wrapper right fixed">'
+            print '<div class="github-fork-ribbon-wrapper right-bottom">'
             print '<div class="github-fork-ribbon"><a href="'
             print page.github
-            print '">Fork me on GitHub</a></div></div>'
+            print '">Fork this with Git</a></div></div>'
     %-->
     <div id="wrap"><div id="nav">
         <ul>