added autogen.sh to regenerate the build environment

autogen.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+# $Id$
+aclocal
+if test $? -ne 0; then
+	exit
+fi
+automake --add-missing
+if test $? -ne 0; then
+	exit
+fi
+autoconf
+if test $? -ne 0; then
+	exit
+fi
+./configure $@