Identity owns <id> property, not <name>

[Airead]

flask_principal's class Identity has not name property, fix it.

class Identity(object):
    def __init__(self, id, auth_type=None):
        self.id = id
        self.auth_type = auth_type
        self.provides = set()

[avidas]

+1 this fixes the issue

[sincerefly]

This PR is useful