Updated GUI:

Imported the used VLC icons on all quality levels. Used a GIMP script (stored in the folder GIMPScript) to change the hue from VLC orange to Tribler orange. changed the color of the location bar in the videoplayer to Tribler orange.
Reverted the star icons, because they were also changed by the hue script.
Merge pull request #33 from wtud/VLCIcon

Because this pull request contains only icons, a gimp script and a colour change in an xml file, it is merged without passing the tests first.