Added Metal Sanic

I will make this short and simple. I am working on a bunch of new characters in the Sanicball game. And the first one I have for you is Metal Sanic! Here it is
![unity 2014-09-27 18-57-32-94](https://cloud.githubusercontent.com/assets/8942644/4514110/3819014c-4b5d-11e4-8466-33ce3741444d.png)
![unity 2014-09-27 19-02-38-98](https://cloud.githubusercontent.com/assets/8942644/4514112/381d7678-4b5d-11e4-849d-7488d6133b5a.png)
![unity 2014-09-27 19-02-49-04](https://cloud.githubusercontent.com/assets/8942644/4514108/3814afe8-4b5d-11e4-88d5-ab8f119731c5.png)
![unity 2014-09-27 19-02-52-20](https://cloud.githubusercontent.com/assets/8942644/4514109/38156226-4b5d-11e4-98a4-03616f2d21f9.png)
![unity 2014-09-27 19-03-05-34](https://cloud.githubusercontent.com/assets/8942644/4514111/381a0894-4b5d-11e4-88b6-c7f29e66f84a.png)