Prettier landing page
Update readme with demo link
* Improved weighting of scores and decay scores over time
* Improved query performance by removing a join requirement
Add Paperclip validator
Add unit and functional tests, bug fixes
Adjust voting algorithm to discourage 5's from voting everybody up/down
Adjust BeenzValidator description to be meaningful
Add sample responses to documentation
Add created_at to user serializer
Add /notifications API endpoint
Add an optional limit parameter when fetching notifications
Add another test that notifications works without limit parameter