STREAMS-156 | Removed default id value in Activity schema
STREAMS-156 | Fixed issue in MoreoverUtils where we could get a NPE if an ID for the Activity was not set
Merge PR#72 'robdouglas/STREAMS-156'
Merge branch 'master' into STREAMS-157

Conflicts:
	streams-contrib/streams-persist-elasticsearch/src/main/java/org/apache/streams/elasticsearch/ElasticsearchPersistWriter.java
Merge branch 'STREAMS-157' of https://github.com/robdouglas/incubator-streams into STREAMS-157