Log Message:
Update msgpack-python to 0.4.4.

0.4.4
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:release date: 2015-01-09

Incompatible Changes
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Changes
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Bugs fixed
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* Fix compile error.

0.4.3
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:release date: 2015-01-07

Incompatible Changes
--------------------

Changes
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Bugs fixed
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* Unpacker may unpack wrong uint32 value on 32bit or LLP64 environment. (#101)
* Build failed on Windows Python 2.7.