Common BrightSign Methods:
addEventListener(): Use this method to listen for an event.
Syntax:
target.addEventListener(type, listener callback);
type (string): Add an event listener when this type of event occurs?
listener (function): The event listener?
callback (object):?
removeEventListener(): Use this method to remove an event listener.
Reserved for BrightSign Use Only:
checkPassword()
getDigestHash()
toJSON()