Update ruby-msgpack to 0.5.7.

2013-10-12 version 0.5.7:

* Added deserialization support for the new MessagePack spec
Updated devel/ruby-msgpack to 0.5.7
Update ruby-spreadsheet to 0.9.5.

### 0.9.5 / 20.11.2013

Author: Malcolm Blyth <trashbat@co.ck>
Date:   Tue Nov 19 15:14:31 2013 +0000

* Bumped revision
* Fixed author stringname error (damn this 1 based counting)
* Updating integration test to check for comments contained within the cells.
* Checking also for multiple comments in a sheet
Updated math/ruby-spreadsheet to 0.9.5
Update libupnp to 1.6.19.

bug fixes
Updated net/libupnp to 1.6.19