Optionally redirect www-domains to bare domain

If you're in the [no-www camp](http://no-www.org) but still want to serve visitors that aren't, you can now optionally make Nginx redirect (301) a www-domain to its bare domain by setting the new `sslproxy.redirect_www` property to true (false by default).

#### Examples
```
https://www.example.org => https://example.org
https://www.example.org/any/thing => https://example.org/any/thing
https://www.example.org:445 => https://example.org:445
```
And if ` sslproxy.http.enabled` is true:
```
http://www.example.org => http://example.org
http://www.example.org/any/thing => http://example.org/any/thing
http://www.example.org:8080 => http://example.org:8080
```