Added basic up/down voting functionality
  Test are passing.
  May need to provide more test conditions.
Added a migration for an index linking user and review to a vote.
  Cleaned up code.
Added votes model tests.
Added two gems to gem file.
Added votes method and votes tests.
Added find or initialize by
Cleaned up code per Hound's request.
Indented hash literal.
Implemented within block for test.
Fixed votes_controller per request.
Merge pull request #11 from LaunchAcademy/voting

Added basic up/down voting functionality