Add better test coverage of bin and str8 to the JRuby tests
Add better test coverage of bin and str8 to the JRuby tests

These tests should probably be used for the MRI implementation too.
okkez/msgpack-ruby,okkez/msgpack-ruby,larskanis/msgpack-ruby,okkez/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,kou/msgpack-ruby,okkez/msgpack-ruby,ojundt/msgpack-ruby,ojundt/msgpack-ruby,larskanis/msgpack-ruby,cosmo0920/msgpack-ruby,msgpack/msgpack-ruby,msgpack/msgpack-ruby,kou/msgpack-ruby,larskanis/msgpack-ruby,kou/msgpack-ruby,msgpack/msgpack-ruby,cosmo0920/msgpack-ruby,kou/msgpack-ruby,larskanis/msgpack-ruby,ojundt/msgpack-ruby,ojundt/msgpack-ruby