begin progress on comment-voting; commit so i can pull down
fix merge conflicts
Validate username

Code and spec for
username/validation (presence and uniqueness)
fix error in username validation tests
play with routes for nested polymorphic
add voting methods
Merge pull request #19 from alanflorendo/user_votes_on_comments_2

User votes on comments 2
Merge branch 'master' of https://github.com/woolly-bear-caterpillars-2014/imgur-jr into index-styling