add paperclip gem to gemfile
add validation for avatar
fix migration for avatar
add default pic to artists when they dont upload their own
Merge branch 'user_branch' of https://github.com/ospreys-2014/Kendrick into user_branch
fix merge conflicts
fix merge conflicts
fix merge conflicts
Merge branch 'user_branch' of https://github.com/ospreys-2014/Kendrick into user_branch
Merge pull request #77 from ospreys-2014/user_branch

User branch