'Save an OAuth1 access token.
:param token: A dict with token credentials.
:param request: An oauthlib.common.Request object.
The token dictionary will at minimum include
* ``oauth_token`` the access token string.
* ``oauth_token_secret`` the token specific secret used in signing.
* ``oauth_authorized_realms`` a space separated list of realms.
Client key can be obtained from ``request.client_key``.
The list of realms (not joined string) can be obtained from
``request.realm``.
This method is used by
* AccessTokenEndpoint'

def save_access_token(self, token, request):

    raise NotImplementedError(u'Subclasses    must    implement    this    function.')
