Updating COPYING because I think some authors were forgotten.

[[Imported from SVN: r6565]]

COPYING

@@ -10,22 +10,30 @@ Copyright holders:
 2004--2012    Jorrit Fahlke
 2008          Bernd Flemisch
 2005--2010    Carsten Gräser
-2011--2012    Christoph Grüninger
+2010--2012    Christoph Grüninger
 2006          Bernhard Haasdonk
+2009          Leonard Kern
+2005--2007    Sreejith Pulloor Kuttanikkad
 2003--2012    Robert Klöfkorn
 2010--2011    Andreas Lauser
 2007--2011    Sven Marnach
+2010          Rene Milk
 2011          Steffen Müthing
-2003--2005    Thimo Neubauer
+2003--2006    Thimo Neubauer
 2011          Rebecca Neumann
 2008--2012    Martin Nolte
 2004--2005    Mario Ohlberger
 2008--2012    Elias Pipping
-2005--2007    Sreejith Pulloor Kuttanikkad
+2009          Atgeirr Rasmussen
 2003--2012    Oliver Sander
+2006--2011    Uli Sack
+2006          Klaus Schneider
+2009--2011    Bård Skaflestad
+2011          Jonathan Youett
 
 2004          roland(?)
 2005          uid2029(?)
+2011          Dan (r6475)
 
 The DUNE library and headers are licensed under version 2 of the GNU
 General Public License (see below), with a special exception for