Fixed #40, added custom sessions_contoller for skipping is_nickname_not_empty?
Fixed #39, drop default value of nickname.
use blank? method instead of to_s.empty?
show name of reference (#35)
refactor #attach_reference_link. Use hash instead of Struct.new (#35)
remove needless comment
render :json is refactored with ActiveModel::Serializer
ProjectController#members is missing, added email to UserSerializer
deprecate HistoriesController#list_members
#50 파일 삭제
#27 Remove unused code & #52 Set new url routing for user using nickname
Merge pull request #53 from DonutWorks/feat/show-name-of-reference

show name of reference (#35)
Merge pull request #54 from DonutWorks/refactor/as-json-with-serializer

Refactor/as json with serializer
Merge branch 'master' of https://github.com/DonutWorks/ToDo.nut into refactor/deprecrate-list_members

Conflicts:
	app/controllers/histories_controller.rb
	config/routes.rb
Merge pull request #55 from DonutWorks/refactor/deprecrate-list_members

deprecate HistoriesController#list_members
Merge branch 'master' of https://github.com/DonutWorks/ToDo.nut into fix/issue-40

Conflicts:
	config/routes.rb
Merge pull request #48 from DonutWorks/fix/issue-40

Fixed #40, added custom sessions_contoller for skipping is_nickname_not_...
Merge branch 'master' of https://github.com/DonutWorks/ToDo.nut into fix/issue-39

Conflicts:
	db/schema.rb
Merge pull request #49 from DonutWorks/fix/issue-39

Fixed #39, drop default value of nickname.
Merge branch 'master' of https://github.com/DonutWorks/ToDo.nut into feat/project-authentication-7

Conflicts:
	app/assets/javascripts/histories.js
	app/controllers/histories_controller.rb
	app/controllers/projects_controller.rb
	app/controllers/todos_controller.rb
	app/helpers/histories_helper.rb
	config/routes.rb