Docu update.

doc/tex/contributors.tex

@@ -130,6 +130,7 @@ Here is an incomplete list:
 \mbox{Kristina Fr\"ohlich},
 \mbox{Oliver Fuhrer},
 \mbox{Monika Esch},
+\mbox{Estanislao Gavilan},
 \mbox{Pier Giuseppe Fogli},
 \mbox{Beate Gayer},
 \mbox{Veronika Gayler},
@@ -170,6 +171,7 @@ Here is an incomplete list:
 \mbox{Bjorn Stevens},
 \mbox{Martina Stockhaus},
 \mbox{Claas Teichmann},
+\mbox{Adrian Tompkins},
 \mbox{J\"org Trentmann},
 \mbox{\'Alvaro M. Valdebenito},
 \mbox{Geert Jan van Oldenborgh},