README update
add IChannel#last_msg … closes #13.
release v5.2.0
experimenting with new API
UNIXSocket implements Interface
test interface instead of subclass from Interface
prepare for redis support
update ChangeLog.txt
remove adapter_ prefix from arg
IChannel::UNIXSocket can be serialized by Marshal(with some cavaets)
update README
default to Marshal, remove serializer from adapter_options.
release v6.0.0
add test case for serialization in child.
work on new version
default to Marshal.
add .pryrc
add pry to gemfile
add IChannel::Redis
todo