Delete unused classes

...n/java/de/unikoblenz/fgbks/api/test/GreetingResource.java

...i/src/main/java/de/unikoblenz/fgbks/api/test/TestApi.java

...in/java/de/unikoblenz/fgbks/api/test/WordnetServiceX.java

...i/src/main/java/de/unikoblenz/fgbks/core/test/Person.java

...src/main/java/de/unikoblenz/fgbks/core/test/Synonyms.java