don’t “go together like rama lama lama ka dinga da dinga dong”?Teenagers and “Grease,” according to two school administrations in Australia who have nixed the ’70s-made, ’50s-themed musical — and subsequent movie, starring John Travolta, Olivia Newton-John and Stockard Channing — from their theatrical repertoire.Students from two kindergarten through grade 12 schools in Perth — Presbyterian Ladies’ College (PLC) and Scotch College — have reportedly protested against future productions of