Added a contact email address for myself.

Added myself to the AUTHORS, NICKS and GUI contributors files. Also
fixed the sort order in AUTHORS and NICKS when adding myself as there
were a couple of entries in both that were not quite in alphabetical
order.

gui/index.html

@@ -1088,6 +1088,7 @@
           <li class="auto-generated">Chris Howie</li>
           <li class="auto-generated">Chris Joel</li>
           <li class="auto-generated">Colin Kennedy</li>
+          <li class="auto-generated">Daniel Bergmann</li>
           <li class="auto-generated">Daniel Martí</li>
           <li class="auto-generated">Dennis Wilson</li>
           <li class="auto-generated">Dominik Heidler</li>