By: Mark Barber The post-apocalyptic Canadian film Turbo Kid has only one audience in mind: kids who grew up on Power Rangers.  Yet the film is too gruesome and violent for kids, and too vacuous for anyone else. Set in a desolate post-apocalyptic world, an unnamed kid (Degrassi’s Munro Chambers; character simply billed as “The Kid”) finds a suit that formerly belonged to the comic book/real life superhero character Turbo Man (unrelated to a similar character…