Delete unicorn dependency
Refactoring code style
New comment invisible for not authenticated users
Change css: add outline:none for all links
Change css: add text-decoration:none for all links
Delete cookies in Articles#delete
Refactoring Comments#index: move Comments.new to controller
Fix max comment's title on 42
Fix spelling
Fix Users#delete

Now, comments and articles have not deleted when user deleting.
Update rails