add button "forgotten password"
create controller password_reset; action new & edit
new routes
add new migration
add new method 'send_password_reset'
create mailer; add some instruction
add a default url
new migration add_auth_token_to_users
merged with master
minor css style
delete get "password_resets/new"
delete comments
finish functional test for password_reset_controller.rb
merge with forgoten-password branch