Build authorization URL for User Agent.

def auth_user_get_url(self):
		'Build authorization URL for User Agent.'
		if not self.client_id: raise AuthenticationError('No client_id specified')
		return '{}?{}'.format(self.auth_url_user, urllib.urlencode(dict(
			client_id=self.client_id, state=self.auth_state_check,
			response_type='code', redirect_uri=self.auth_redirect_uri )))