Add clearView link while searching

See #1517

![image](https://cloud.githubusercontent.com/assets/339611/3944416/863fe86c-2601-11e4-8911-bbfc65ca04f1.png)

http://www.reddit.com/search?q=test&sort=relevance&t=all#res-clear-view
Don't forget the click handlers to actually do the magic of showing/hiding search options.