meego mobile detection

Added support for MeeGo OS, used by the Nokia N9 phone

User-agent string is "Mozilla/5.0 (MeeGo; NokiaN9) AppleWebKit/534.13 (KHTML, like Gecko) NokiaBrowser/8.5.0 Mobile Safari/534.13"

https://bugzilla.mozilla.org/show_bug.cgi?id=682969