Add grid dropdown support. Move flappy random option to end

Multiple column:

![image](https://cloud.githubusercontent.com/assets/206973/3125371/657cd75e-e789-11e3-982f-09fb8a03f57a.png)

Single column (as before):

![image](https://cloud.githubusercontent.com/assets/206973/3125366/4f297c78-e789-11e3-9b16-8aabd885adc5.png)