Add helper method for gravatar
Add thin and quiet_assets

to make the command line output a little cleaner
Clean up code
Delete email and name, add user_id to comment
Add belongs_to and specify second-order association for eager loading

:include => :user is for eager loading
Set up has_many relationships
Add hidden field for user_id (i.e. current_user.id)
Add Gravatar image to show view of comments

the method "avatar_url(comment.user) is to be found under helpers --> application helper