Make Jenkins' 'ImageJ-style' job happy

By fixing the copyright like so:

	prefix='Copyright (C) 2009 -'
	suffix='Board of Regents of the University of'
	sed -i "s/$prefix 2012 $suffix/$prefix 2013 $suffix/" \
		$(git ls-files \*.java)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>