Add option to toggle/clear recents 

![screen00016](https://f.cloud.github.com/assets/3000282/700040/81f3aece-dd32-11e2-8c9b-37fc8c5b6efc.jpg)
![screen00018](https://f.cloud.github.com/assets/3000282/700041/83e35068-dd32-11e2-9106-505a4fbffdbc.jpg)
![screen00019](https://f.cloud.github.com/assets/3000282/700042/85747f74-dd32-11e2-90ae-1c22eaaf34c0.jpg)