Supported bin and str deserializers for minor release

Based on "Upgrading MessagePack specification".
For more detail, please see:
https://github.com/msgpack/msgpack/blob/master/spec.md#impl-upgrade

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Merge pull request #63 from msgpack/bin_and_str_minor

BIN and STR support for minor release