WIP: VWF support

These changes allow an integration with the virtualworld framework.

For startup, a file `localconfig.js` should be created in the base directory of LivelyKernel with the following content:

```js
var c = lively.Config;
c.set('lively2livelyAutoStart', false);
c.set('lively2livelyEnableConnectionIndicator', false);
c.set('removeDOMContentBeforeWorldLoad', false);
c.set('manuallyCreateWorld', true);
c.set('changesetsExperiment', false);

// FIXME, for compatibility with requirejs
lively.whenLoaded(function() {
    setTimeout(function() {
        Global.require = Global.requirejs.s.contexts._.require;
    }, 300);
});
```

/cc
@rchadwic
@allisoncorey
@davideaster
@scottnc27603
@eric79