added favicon
added update profile functionality
added user authorization mechanism for edit page
implemented friendly forwarding for not signes in users
updated user index page
added sample users via Faker
added pagination to user index page
refactored user index view
add admin attribute to users
implement destroy action for admins
refactored user new and edit
limited accessibility of new and create User to not signed in users
restrict sign in to not singed in users, refactor friendly redirect specs
add some request info
make admins undeletable by other admins
enable user to delete his account unless he is an admin
enable users account editing and deletion
upgrade ruby version