Client breaks when raising errors

[tschellenbach]

Traceback (most recent call last):
File "examples/etoro_example.py", line 46, in
activity_response = user_feed_crembo.add_activities(activities)
File "/Users/thierryschellenbach/workspace/stream-python/stream/feed.py", line 82, in add_activities
self.feed_url, data=data, signature=token)
File "/Users/thierryschellenbach/workspace/stream-python/stream/client.py", line 203, in post
return self._make_request(self.session.post, _args, *_kwargs)
File "/Users/thierryschellenbach/workspace/stream-python/stream/client.py", line 170, in _make_request
return self._parse_response(response)
File "/Users/thierryschellenbach/workspace/stream-python/stream/client.py", line 115, in _parse_response
self.raise_exception(parsed_result, status_code=response.status_code)
File "/Users/thierryschellenbach/workspace/stream-python/stream/client.py", line 186, in raise_exception
for field, errors in exception_fields.items():
AttributeError: 'list' object has no attribute 'items'