add new studio sprites

Adds six new studio sprites.  One downside is we're running out of good start locations, and the way things are set up, each sprite has a singular start location, meaning you can get crowded sprites even if using only one or two.

![image](https://cloud.githubusercontent.com/assets/1767466/3449311/552404d2-0164-11e4-8d93-7dfb9c2ca3fd.png)

![image](https://cloud.githubusercontent.com/assets/1767466/3449326/a12f7ee2-0164-11e4-8fd1-c98613c8368e.png)

Could this throw off an existing wrap-around starting skin lists? I.e., if spriteStartingImage was the last one and there were supposed to be 2, it would now return wizard, alien instead of wizard, dog.

Not sure if this is relied upon, but might want to double-check levels.js