Footer should be at the bottom, even for small pages.

This regression was caused by me and it sure makes me feel foolish.

Author: tjgrathwell

lib/doc_page.rb

@@ -128,7 +128,7 @@ def body_content
       end
     }
 
-    div(class: 'bottom cf') {
+    div(class: 'bottom') {
       p "Railsbridge Docs"
       p do
         text "Source: "

public/css/doc_page.css

@@ -32,6 +32,7 @@ h1 {
 }
 
 .bottom {
+  clear: both;
   min-height: 60px;
   text-align: center;
   border-top: 1px solid #ccc;