added campaign model
fleshed out models and relationships
removed accidentally added files
fixed bug
added relationship Campaign has_many posts
set up many-to-many relationship for users and rewards
added unit testing for comments
Merge pull request #261 from CalvinFernandez/comments-unit-test

added unit testing for comments
resolved conflicts
Merge pull request #264 from CalvinFernandez/CalvinFernandez-campaign

Campaign
Resolve merge conflicts