TogetherJS build of 690b6b895f510bb5e451b59bcf4818ad053a3a03

HUB_URL=https://greenlake.wmflabs.org grunt build buildsite --no-hardlink --base-url //pinklake.wmflabs.org/extensions/TogetherJS/togetherjs

With hub server in hub/

(chrome doesn't support protocol-relative URLs in websockets, apparently.)