Create Torus Mesh

A Simple Torus mesh allowing user to specify tube divisions as well as radius divisions.
![largetorus](https://cloud.githubusercontent.com/assets/4525427/3791137/8b36c05c-1b2a-11e4-9046-dc39cca39296.png)
![flatdisc](https://cloud.githubusercontent.com/assets/4525427/3791139/92f26314-1b2a-11e4-840a-103ee99bcf5a.png)
![3side](https://cloud.githubusercontent.com/assets/4525427/3791140/96a0468e-1b2a-11e4-8228-4b1c6f25d680.png)
![other](https://cloud.githubusercontent.com/assets/4525427/3791141/9b74830a-1b2a-11e4-93ca-37a821c9be5c.png)