Merge branch 'master' into user-logged-in
add logged_in before filter for answer creation and spec
clean up
change create answer test in question feature tests to sign in user
Merge pull request #14 from purple-martins-2013/user-answer-filter

User answer filter
answer creation associates answer with current user
Merge branch 'master' into user-logged-in
Merge pull request #17 from purple-martins-2013/answer-creation-association

answer creation associates answer with current user
resolve merge conflicts
Merge branch 'master' of https://github.com/purple-martins-2013/snack-overflow
Merge branch 'master' into answer-scores
implement the ability to downvote, and add model tests for the upvote! and downvote! methods