Added RadialClay and BrokenRadialClay

I expanded the radial rug designs to clay.  I also added a parameter that influences the "straightness" of the resulting designs of the rugs.  The clay designs are straighter than the wool rugs.  Here are some screenshots:
![2013-10-29_20 37 32](https://f.cloud.github.com/assets/2229288/1434130/3772f914-410e-11e3-80d5-6d2ee2f7dd8a.png)
![2013-10-29_20 38 41](https://f.cloud.github.com/assets/2229288/1434131/377abaf0-410e-11e3-920d-85d3c5880bf1.png)
![2013-10-29_20 38 48](https://f.cloud.github.com/assets/2229288/1434132/377c39c0-410e-11e3-87b5-012ebfca8b64.png)