Queue-util

- Update `unicode-msgpack` serialiser to date-aware implementation
- Ignore unicode_errors on read and write with `unicode-msgpack`

- Allow specification of `userid` and `password` when connecting

- Fix `msgpack-python` dependency

- Add the `unicode-msgpack` serializer and make msgpack a dependency

- fix bug with the order of specifying serializer and compression per new item

- allow users of queue_util to specify serializer and compression per new message
- [breaking] Update kombu to a version that supports Python 3.4