Merge pull request #3500 from olivierlacan/error-whitespace

CSS fix to prevent error output from being breaking out of body element.

actionpack/lib/action_dispatch/middleware/templates/rescues/layout.erb

@@ -16,6 +16,7 @@
       background-color: #eee;
       padding: 10px;
       font-size: 11px;
+      white-space: pre-wrap;
     }
 
     a { color: #000; }