Checks if a given user has the ability to perform the action on a subject

    :param user: A user object
    :param action: an action string, typically 'read', 'edit', 'manage'.  Use bouncer.constants for readability
    :param subject: the resource in question.  Either a Class or an instance of a class.  Pass the class if you
                    want to know if the user has general access to perform the action on that type of object.  Or
                    pass a specific object, if you want to know if the user has the ability to that specific instance

    :returns: Boolean

def can(user, action, subject):
    """Checks if a given user has the ability to perform the action on a subject

    :param user: A user object
    :param action: an action string, typically 'read', 'edit', 'manage'.  Use bouncer.constants for readability
    :param subject: the resource in question.  Either a Class or an instance of a class.  Pass the class if you
                    want to know if the user has general access to perform the action on that type of object.  Or
                    pass a specific object, if you want to know if the user has the ability to that specific instance

    :returns: Boolean
    """
    ability = Ability(user, get_authorization_method())
    return ability.can(action, subject)