Add missing function parameter and fix some docstrings

* Fix a few PEP-8 whitespace issues
* Fix some bad docstring with incorrect FQ class references
* Add missing `scope` parameter to `oauth2.web.SiteAdapter.render_auth_page` since it is called in `oauth2/grant.py` as:

```python
return self.site_adapter.render_auth_page(request, response,
                                          environ,
                                          self.scope_handler.scopes)
```