parse

https://parse.com/tutorials/login-and-signup-views

presentViewController関連

http://wagyu298.hatenablog.com/entry/2013/06/19/101816

appdelegateで presentViewControllerするときのissue

• http://stackoverflow.com/questions/13430179/appdelegate-rootviewcontroller-and-presentviewcontroller
• http://stackoverflow.com/questions/7067443/objective-c-how-to-present-modal-view-controller-from-appdelegate