(#2915) - Replication busted if skipSetup true

Fix by deferring the callback as per  https://github.com/pouchdb/pouchdb/issues/2915#issuecomment-60303047
Could you change this to 

```
process.nextTick(function () { 
   callback(null, self);
});
```

The indentation needs to be fixed as well, thanks a lot