forked from loafle/openapi-generator-original
* merge with master * remove zoo specific artifact names * fix duplicate doublequote * #3904 add samples for retrofit2 * #3904 clean json field retrieval * #3904 allow non-abstract parent class
* merge with master * remove zoo specific artifact names * fix duplicate doublequote * #3904 add samples for retrofit2 * #3904 clean json field retrieval * #3904 allow non-abstract parent class