allow handle_result to change the result and exc_info
coverage for Responder's handler of non-serializable values
pep8
clarify comment
add safety around un-repr-able and un-unicode-able values
add disaster avoidance serialization to legacy responder; improve comments around guaranteeing json-serializability
nicer patch for kombu producer pool; separate module for rpc_responder tests
use ANY instead in arbitrary getitem index
Release v1.10.0
Merge pull request #139 from onefinestay/mutating-handle-result

allow handle_result to change the result and exc_info