define AccessToken model
define relationship
AccessToken functions

ref: https://github.com/NoamB/sorcery/pull/415
fix timing to execute callback methods of AccessToken
sessions#create
Merge branch 'master' into authentication

Conflicts:
	config/routes.rb
update seeds/development.rb
require login
sessions#destroy
install whenever
bundle update
delete expired tokens on schedule
check token validity
make `rake db:seed:development` idempotent
rename `rake db:seed:development` to `rake db:seed:dev`
Merge pull request #7 from iTakeshi/authentication

了解です。Mergeしました。