Merge pull request #59 from j15e/feature/popular-sorting

Feature/popular sorting (with postgresql)
Update emotions location on GitHub for new feature
Increment karma when submission upvoted
Merge pull request #52 from opencodeqc/feature/user-score

Increment user's score when submission is up voted
Prefer lambda over -> for multiline block
Move popular scope to Post model since its not reusable ATM