Bug fix

Because a commit i've submitted,
that add clear-fix div after navigation &lt;a> elements,
![third-level-nodes-bug](https://f.cloud.github.com/assets/5505691/2214827/f7fe7f6e-99dd-11e3-9de3-a4e04e87560d.png)
third level nodes &lt;i> tags will have wrong height.

Signed-off-by: Edward Cheng &lt;c4150221@gmail.com>