#17 renamed entity listeners to instance listeners
#49 declared instance variables as final
#17 initial implementation of instance listeners
Merge remote-tracking branch 'origin/master'

Conflicts:
	impl/src/main/java/com/buschmais/cdo/impl/cache/CacheSynchronizationService.java
#17 initial implementation of instance listeners
#17 use write cache to determine updated instances
#17 added support for typed listeners