RPC enhancements:
- single consumer queue
- error handling prototype
rpc consumer now shares (doesn't duplicate) queue consumer
pyflakes
Retry policy for Responder
Non-leaky tests via better fixtures
addressing code review
Better get_provider_for_method
Using RPC_EXCHANGE_CONFIG_KEY
Merge remote-tracking branch 'origin/evolutionary' into bulletproof-rpc
Updated test for change in parent branch
Merge pull request #48 from onefinestay/bulletproof-rpc

Bulletproof rpc