Discards any resources used by the object. After this is called, the
object is not in a usable state and should be discarded (calls to
addListener will throw after the object is disposed).
first you must call the init() method
the token will be searched in local storage
the appID parameter is the identifier of your application. You can find it here https://vk.com/apps?act=manageappId by default - VK Me app ID