Added SSL verification as modifiable settings.

By default, SSL certificates remain verified by default when proxying requests. This change introduces changes to support use cases that we have run across:

* When developing locally (on our development machines) we use an SSL certificate that is not signed.
* Accessing internal systems on our Intranet that don't have signed certificates.

This change will allow developers to control the SSL verification in the `requests` library via SETTING, or if additional business logic is required, they can override the `get_verify_ssl()` method to introduce their specific business logic.