Added a user new page and the spec
Refactor routing specs into different files
Modify routes to make user controller work
Modified the abilities of user and added a spec for it
Moved the error page from books controller to application controller
Add a new employee user and add a password for fake users
Add a new employee user to users fixture
Add 'add new user' button for admin profile page
Refactor users controller and add a spec for it
Add a feature test to add a new user