Update LICENSE

Try to mark it as MIT.

Author: chschulte

LICENSE

@@ -1,10 +1,13 @@
-		  GECODE LICENSE AGREEMENT
-			 
-This software and its documentation are copyrighted by the
+GECODE LICENSE AGREEMENT
+
+	(MIT License)
+
+This software and its documentation are copyrighted by the 
 individual authors as listed in each file. The following
 terms apply to all files associated with the software unless
 explicitly disclaimed in individual files.
 
+
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including