Add K1 simplified repeat block to maze and artist

* Adds common block module
* Adds simplified repeat block with placeholder icon:

![image](https://cloud.githubusercontent.com/assets/206973/2757705/6367d83a-c987-11e3-928b-96e774c2f9ff.png)

![image](https://cloud.githubusercontent.com/assets/206973/2757711/7bb93762-c987-11e3-8fe8-0a6227120102.png)