Fix building (externally) with browserify
Fix building (externally) with browserify

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