rake db:seed:development
update README
Merge pull request #3 from iTakeshi/dev_seed

Merged. Thanks!
create rake task "db:dev"
update README
fix breakline in README
Merge pull request #4 from iTakeshi/setup_dev_db

rake db:dev
users#index, users#show
Merge pull request #5 from iTakeshi/get_users

OK. I will soon build front-end part in this site.
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