Fog jg user unique vote

Fixed opinions so that user can only make one per matchup. Also fixed tests!

![husky_puppy](https://cloud.githubusercontent.com/assets/6283512/4446619/159ac99a-4804-11e4-9882-28b0e62e7259.jpg)

Shouldn't delete this file -- you want the `.env.example` file, just not the `.env` file, under git control.  That way your collaborators know which credentials/ENV variables they need to set.