Fix and features test for showing resources of a MediaSet/FilterSet

Squashed commit of the following:

commit 3ca6deba4bd793285fce92669a9da4878c07002a
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri May 17 15:57:02 2013 +0200

    Added feature test for showing Resources in MediaSet and FilterSet

commit dd14a7c8e40458b31da5a7f91a3caa0f9f243fa5
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri May 17 11:10:55 2013 +0200

    Fix showing contents of a MediaSet/FilterSet