Add models and associations for contributor and contribution
Add relationship to contributor through join table contributions
Add migrations
Add has_many contributors
Migrate
Remove contributors column
Remove contributors attribute creation
Correct spelling
Have contributors to path return an array
Update repository controller to create contributor objects associated with repo and then build associations between them and individual files
Correctly display contributors
Add working logic to code review controller...currently breaks with multiple contributors...

--> NEEDS A REFACTOR
Comment out validations for testing
Add github user model and migration connected to contibutor. Not all contributors will have gh user accounts, this will help us differentiate and prevent nil records being created.
Adjust migrations to integrate the new relationship between contributors and gh users
graph view template compmleted
added partials to graph view template
conflicts resolved
Merge pull request #100 from alexung/user_data_visualization

User data visualization
abstracted another partial for table row