Add toggle for showing votes on expanded proposal card

On load:
![image](https://cloud.githubusercontent.com/assets/750477/5483520/94efd1f0-86d8-11e4-88d0-a9bd0eb64b83.png)

After clicky clicky:
![image](https://cloud.githubusercontent.com/assets/750477/5483525/b1dce686-86d8-11e4-81ba-7d06868326ed.png)