Proper global JS value, domain, always include cfg block in js

* JS config is now stored in widnow.mw.zeroConfig
* Add domains list to config js/api result - ['m.wikipedia.org', ...]
* Add {enabled:false, id=123-45} for disabled zero traffic
* Add js config script for non-unified code.
* getWikiInfo(true) now returns domain as part of info

Change-Id: Ie6e3b1f8e0f4c753929a912fa887ef3e50703bd5