add testcases for user profile update
add User#edit
add testcase
add helper method 'sign_in'
implement Settings page
add testcases
implement User#update
implement User#update
add testcases for User#edit, #update
add User#signed_in_user
add before_action into User
fix testcase for authorization
fix markup
add testcases for authorization
add User#current_user as before_filter
fix User#edit, #update
add SessionsHelper#current_user?
fix typo
fix typo
fix typo