test for GPMONGODB-278
fix failing tests
fix for GPMONGODB-262 "Mongo GORM Plugin ignores persistence event listener return values"
Merge branch '1.x'

Conflicts:
	grails-datastore-core/src/test/groovy/org/grails/datastore/mapping/model/TestPersistentEntity.groovy
	grails-datastore-gorm-test/src/test/groovy/org/grails/datastore/gorm/SimpleMapTestSuite.groovy