parseZone passes all arguments to moment

moment.parseZone is just a shorthand for moment().parseZone(), so make sure
that all arguments passed to the static function end up in the moment factory
function.
Merge pull request #1447 from ichernev/bugfix/parse-zone-proxy

parseZone passes all arguments to moment

@changelog
@section bugfix
@description parseZone passes all of its arguments to the moment factory