Update COPYING copyright statement to 'Copyright (c) 2013 Eric Wasylishen, Quentin Mathe, Christopher Armstrong'

git-svn-id: svn://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@9897 7b3f36aa-e6db-49c1-8b4c-66eac1997e64