Added vertical drag back in

Vertical drag should be enabled now #57.

![screen shot 2014-10-29 at 1 19 18 am](https://cloud.githubusercontent.com/assets/6354033/4822618/5c90a336-5f44-11e4-91cd-ebee5045faa9.png)


![screen shot 2014-10-29 at 1 19 30 am](https://cloud.githubusercontent.com/assets/6354033/4822615/566e279e-5f44-11e4-8aa2-7bbc57de7859.png)