implemented upvote and downvote for both questions and answers
implemented comment button to show comments for questions and answers
Merge pull request #4 from tiger-swallowtails-2014/william

User can sign up, sign in, and sign out
merged with william's stuff
Merge pull request #5 from tiger-swallowtails-2014/mike

Mike
fixed signin and signup
added links to each question on homepage
Merge pull request #6 from tiger-swallowtails-2014/mike

Mike
Style Questions page