Add possibility to use credentials on a HTTP proxy

[wurzelkuchen]

Quick Description

We do have the possibility to configure a proxy inside Neodymium. If the proxy is a socks proxy, we can use authentication. For HTTP proxies however this is currently not possible.
Since webpages can use geolocation lookups to provide specific versions of their page, having a secured proxy would be great.

User Story

As a testautomation engineer,
I want to simply configure an authentication for a given HTTP proxy
so that I can access pages, which are accessible from certain geolocations only

Functional Requirements

• Add a way to use a proxy with an authentication via our configuration
• Add neodymium.proxy.userName and neodymium.proxy.password properties to configure this proxy

Documentation Requirements

• Document the new configuration accordingly in our wiki

Test Requirements

• Do a smoke test on an external test suite like the neodymium example with a given proxy
• Add unit tests as far as possible

Additional Information

A possible solution was done for a customer project. Ask @oomelianchuk for details on this.