Add SlicerToKiwiExporter extension

Homepage: http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Modules/SlicerToKiwiExporter

Source: https://github.com/jcfr/SlicerToKiwiExporter

Icon: https://raw.github.com/jcfr/SlicerToKiwiExporter/master/SlicerToKiwiExporterLogo.png