test(bpmn_data): add integration test for single send receive
Merge branch 'integration_test' of github.com:BPMNData/camunda-bpm-platform into integration_test

Conflicts:
	engine/src/test/java/de/hpi/uni/potsdam/test/bpmn_to_sql/integration/MessageIntegrationTest.java
	engine/src/test/resources/de/hpi/uni/potsdam/test/bpmn_to_sql/integration/MessageIntegrationTest.testSender.bpmn20.xml