added getter method for class' writer instance
added getter method for class' writer instance
added tests for marshaller and unmarshaller
refactoring: clearer interface methods; adjusted impls and tests
debugging getPositionOf; documentation; added CsvAnnotationReader test
added and extended tests for CsvAnnotationReader
debugging: value may be null -> print empty value in csv
extended tests
extended test for getPositionOf function
quoteChar property for CsvConfiguration; impl
added javadoc