Pass tests with python-msgpack >= 0.3
Pass tests with python-msgpack >= 0.3

Current test suite pass with python-msgpack v0.2 but fails with python-msgpack
v0.3 and later due to changes in the library. Modern distributions ship
python-msgpack > 0.3 for very long time ago.

nicolasff/webdis,nicolasff/webdis,nicolasff/webdis,nicolasff/webdis,nicolasff/webdis