removed some spaces from bin/express

this is how it used to look:
```js
app.use(express.methodOverride());
  app.use(express.cookieParser('your secret here'));
  app.use(express.session());
app.use(app.router);
```
this is how it looks now:

```js
app.use(express.methodOverride());
app.use(express.cookieParser('your secret here'));
app.use(express.session());
app.use(app.router);
```