Merge branch '0.3-maintenance'

Conflicts:
	core-parent/annotation-processor/pom.xml
	core-parent/annotations/pom.xml
	core-parent/core/pom.xml
	core-parent/model/pom.xml
	core-parent/pom.xml
	core-parent/util/pom.xml
	integration-test/integration-test-core/pom.xml
	integration-test/mapper-component/pom.xml
	integration-test/mapper-constructor/pom.xml
	integration-test/mapper-enum/pom.xml
	integration-test/mapper-factory/pom.xml
	integration-test/pom.xml
	integration-test/use-mapper/pom.xml
	pom.xml
[#15] do not generate the MapperFactory class for simple mappers

the class MapperFactory is not generated at all anymore