Update the JavsScript keywords list?

[GoogleCodeExporter]

I'm happy to submit a patch for this but I thought I'd ask first, I notice the 
the JavaScript list of keywords is based off the C list but the C list include 
things that are not in JavaScript (like "auto", "extern", "inline", "volatile") 
and the JavaScript list itself is missing some of the new ES6 things like 
"yield", "implements", "let", "interface", "package" etc..

IShould I make a patch for that?

Original issue reported on code.google.com by [email protected] on 19 Jun 2014 at 7:54

[GoogleCodeExporter]

Hmm, I  now see I must have been staring at the wrong code as I don't see the 
JavaScript list including the C list but still there is the ES6 stuff. thoughts?

Original comment by [email protected] on 19 Jun 2014 at 7:55

[GoogleCodeExporter]

I added "instanceof" to the JSCRIPT_KEYWORDS in my local copy of prettify.js.

Original comment by [email protected] on 21 Jun 2014 at 10:24