added votes table and Vote model, Review and Cat associations
basic vote functionality working
Added basic functionality for review votes
Polished voting method, added paw images, highlighting of votes
minor html polish
Tests pass
Refactor votes.

Move voting logic to separate controller.
Eliminate duplication within cats and reviews controller.

Also configure rspec to use focus: true.
Added index to votes, added migration.
Merge pull request #16 from LaunchAcademy/voting

Cat/Review voting & tests related to it