Studio k1 blocks

![image](https://cloud.githubusercontent.com/assets/206973/3138035/4b96fcde-e86a-11e3-9857-9f7834083a85.png)

![image](https://cloud.githubusercontent.com/assets/206973/3154162/3536ff88-eaa5-11e3-8f0b-aa3d0a622cb4.png)

![image](https://cloud.githubusercontent.com/assets/206973/3154172/4dfcfa5e-eaa5-11e3-9ed2-dc4204d6e855.png)

Tests at https://github.com/code-dot-org/dashboard/pull/759