It’s not surprising that Disney set a battle between a stegosaurus and a Tyrannosaurus rex to a soundtrack of Stravinsky’s “Rite of Spring” in the 1940 film “Fantasia.” For most children, that’s what the music is about. But few are probably aware that when the ballet made its debut at the Théâtre des Champs-Élysées in 1913, a near riot broke out in the audience.