Use newest Javascript

[arantius]

https://developer.mozilla.org/en/JavaScript/New_in_JavaScript/1.8.5

Firefox 4+ supports JS 1.8.5.

[arantius]

Also 3.5+ does 1.8.1:
https://developer.mozilla.org/En/JavaScript/New_in_JavaScript/1.8.1

[arantius]

Done, and the per-function strict mode ( https://developer.mozilla.org/en/JavaScript/Strict_mode#Strict_mode_for_functions ) now works in Firefox 4+.

(Per-script doesn't because A: we prepend a newline between the (possibly empty set of) requires and script itself and B) thus the whole "crossing streams" issue happens, with requires, anyway. So authors should just wrap themselves up in a cozy function if they want strict mode.)