Add saga latency metric (#224)

records the execution time of the entire saga, from it's creation until deletion (in ms). having the "Service", "SagaType", "Initiator" as labels|

fix wrongly set correlation ids when sending a command (#220)

* adding the SagaCorrelationID header only for replies

Fixing a bug where grabbit would set the message.CorrelationID and the message.SagaCorrelationID header even
if the message was a command and not a reply.

* fixing minor documentation issue

adding all logging context data to worker and saga log entries (#215)

* adding all logging context data to worker and saga log entries

* added logging with context when command or reply received for saga def but no saga correlation id found

* removing minor discrepancies and updating documentation

Update README.md

added documentation on serialization support (#177)

* fixed emperror url format

* added serialization documentation

allow getting the saga id of the current invoked saga (#168)

set the correct Type and Content-Type headers on out going messages (#…

…160)

* set the correct Type and Content-Type headers on out going messages

* refactoring

Handle empty body messages (#147)

added metrics on deadLetterHandler, refactored HandleDeadLetter inter… (

#122)

* added metrics on deadLetterHandler, refactored HandleDeadLetter interface to receive new DeadLetterMessageHandler type

* fix dead letter test and a build error

* added documentation for DeadLetterMessageHandler, also fixed poison spelling throughout code

* retrigger build

Merge pull request #91 from wework/fix-conn

closing rows when querying transactional outbox fails