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)
```