streamline-express did not work in fibers mode

From https://github.com/Sage/streamlinejs/issues/149

The `wrap` function returned `undefined` in fibers mode because streamline transforms the code to:

```
app.get("/root", fstreamline__.create(function(req, res, _) { ... }));
```
So, `function(req, res, _)` is not passed _as is_ in fibers mode, it is already wrapped and passed as a `function F()`  (see streamline's lib/fibers/runtime.js).

I have only tested with the `function(req, res, _)` signature. So it needs more testing.