This test was removed.  Does that mean that http-http replication just will not work anymore?  Or will it work if I do:

```js
var db1 = new PouchDB('http://foo');
var db2 = new PouchDB('http://bar');
db1.replicate.to(db2);
```

?  Because if that's the case, we should maybe throw an error with a descriptive message, like what we did for allDbs.