Added votes model and migration
Added upvote / downvote.  Added average rating to index page.  Added sorting reviews by upvote/downvote count.
Added destroy methods
Merge branch 'master' into upvote
added save to helper methods for updating counter cache on review votes
Fixed callback methods for vote creating, updating, and destroying
Fixed ordering of reviews by upvote count desc
Added user_id to foodtrucks table.  Added user seeds
Fixed issues related to pull request comments.
Fixed destroy for votes
Merge pull request #19 from Maimer/upvote

Upvote