Authenticates to the api and sets up client information.

def _authenticate(self):
        """Authenticates to the api and sets up client information."""
        data = {'username': self.username,
                'password': self.password}
        url = '{base}/client/login'.format(base=self.base_url)
        response = self._session.get(url, params=data)
        print(response.text)
        data = response.json()
        if not data.get('success'):
            raise InvalidCredentials(data.get('reason', None))
        self._populate_info(data)