Empty basePagePath creates absolute path preventing relative urls working

There is a bug in the `basePagePath` code that forces a "/" if not specified.

Easy fix:

```
if (self.settings.basePagePath && self.settings.basePagePath.indexOf('/', self.settings.basePagePath.length - 2) === -1) {
        self.settings.basePagePath += '/';
}
```

Does not add a trailing slash to the default empty `basePagePath`.
