Documentation examples of SSL config options; closes #116

>As of 0.3, you never have to use config - you can always use named arguments to GET() etc. However, it might still be useful if you want to bundle a set of options together.

In that case, then maybe the longest example should be in the `config()` help page.  I'm thinking about your response in #116.  Do you think that last 5-part example above is useful and accurate (after those revisions)?  If so, do you want me replicate the relevant parts in other pages, such as `set_config()`, `reset_config()`, `GET()` and `POST()`?