Register official JodaModule to nflow-ObjectMapper in engine
Clone nflow-ObjectMapper into nflow-rest-ObjectMapper and actually use it in nflow-jetty
Return executionStartTime and -EndTime to ISO-8601 format instead of milliseconds
Added integration test for workflow action history
Actually removed custom JacksonJodaModule and used JodaModule in nflow-tests
Merge pull request #6 from NitorCreations/improved-rest-api-timestamps

REST API action history times to ISO-8601; use official JodaModule for serialization