improved CRF support in JTSFields

 * moved 4326 enforcing to JTSUtil
 * added CRFTranslator to AbstractJTSField
 * added a test/example that makes a custom conversion from ETRS-TM35FIN to WGS84 (+1 squashed commit)
Squashed commits:
[35d4e89] improved CRF support in JTSFields

 * moved 4326 enforcing to JTSUtil
 * added CRFTranslator to AbstractJTSField
 * added a test/example that makes a custom conversion from ETRS-TM35FIN to WGS84