Fixes extra space when thumbnail is within a paragraph.

When a thumbnail image is used within a paragraph tag, you get an extra little bit of space below the image.

![Screen Shot 2013-04-02 at 6 41 07 PM](https://f.cloud.github.com/assets/624446/331296/a1fe63e0-9be6-11e2-8c79-376061f07c0a.png)

No Space
```html
<a class="th" href="../img/demos/demo1.jpg"><img src="../img/demos/demo1-th.jpg"></a>
```
Extra Space
```html
<p><a class="th" href="../img/demos/demo3.jpg"><img src="../img/demos/demo3-th.jpg"></a></p>
```