Updated the license from the license from the Apache License Version 2.0 to the Boost Software License, Version 1.0. Removed unused files.
Replaced boost/ with msgpack/ and BOOST with MSGPACK in Boost.Preprocessor files. Renamed existing macron in versioning.hpp to avoid confict with MSGPACK_PP_*. Removed MSGPACK_USE_BOOST requirement from MSGPACK_DEFINE_MAP.