add image_url to user model attr_accessibles
Merge pull request #11 from ctorstens/development

Development
Fix comment ajax to erase the old value
Merge branch 'development' of https://github.com/ctorstens/ScreenOverflow into form_validation
cleaned up seed and Gemfile
Merge branch 'development' of https://github.com/ctorstens/ScreenOverflow into development
merge conflicts