After a five year hiatus, the Broadway parody revue “Forbidden Broadway” is back with a new edition that makes fun of Broadway shows, actors, and personalities through sketches that satirize the form.  Mostly funny, this iteration is undercut by a tinge of bitterness and resentment toward shifting cultural mores and trends on Broadway.  But, in the end, it’s still the same scrappy, low-budget comedy revue that’s been playing, off and on, since 1982.