Revert "Install Data::MessagePack to try out MsgPack"
Revert "Install Data::MessagePack to try out MsgPack"

This reverts commit c7d04a3834d0dfd0dfab79248ec81f4398215871.

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud