added table for votes and ran migration; created model relationships
added buttons, without js functionality
added seed_dump gem and generated a seed file; playing with ajax
when upvoting on a previously downvoted expense, it removes that downvote expense, and vice versa
refactoring of voting methods in users controller and vote.js
Merge pull request #1 from BudgetApp/upvote/downvote-button

Upvote/downvote button