inspect the service class, not the instance

works better with descriptors
help garbage collector
Merge branch 'help_gc' into v1.11rc
changes + version bump
Merge pull request #144 from onefinestay/v1.10.1_rc

v 1.10.1
remove ChannelHandler.on_error
remove leftover debug
add comment explaining re-raise of socket.timeout as a different error
Use expanded link
Merge pull request #141 from onefinestay/rabbit-fixes

modify rabbit reset order; close more connections
add retry policies to publishers

including hardcoded defaults in rpc proxies