have shellout javascript blocks highlight with the javascript syntax

[Joshua Hawkins]

this part of the Shahid test

33 do! x <- 1 + 4
34 y <- 2 + 3
35 z <- // this is unnecessarily long to demonstrate the javascript editing in forml-mode 36 37 function log(x, y) { 38 return Math.log(x) / Math.log(Math.E); 39 }
40 ans <- x + y
41 return (10 == ans)