update tf example with a note about the new groovyCompatibility option
update tf example with a note about the new groovyCompatibility option

DLu/roslibjs,harmishhk/roslibjs,kbendick/roslibjs,kbendick/roslibjs,jeansebbaklouti/roslibjs,eadlam/roslibjs,harmishhk/roslibjs,DLu/roslibjs,DLu/roslibjs,jeansebbaklouti/roslibjs,chrisl8/roslibjs,harmishhk/roslibjs,chrisl8/roslibjs,eadlam/roslibjs,BennyRe/roslibjs,BennyRe/roslibjs,kbendick/roslibjs