Configured Proxy was not used in ArtifactResolutionProfile while creating the HostConfiguration

Hi Vladimír,

First of all: thank you for your awesome work on this project!

I have found and fixed a small but critical bug where the proxy server configured in `springSecurity.xml` into an `HttpClient` bean is not used when `ArtifactResolutionProfileImpl` creates a new `HostConfiguration` in the method `getHostConfiguration`. This leads to the post-login authentication steps to fail if the application is deployed behind a proxy server.

Kind Regards
Rias