in licence 2012 > 2013

git-svn-id: svn://dev.exiv2.org/svn@3107 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
forgot to commit changes in tags_int.hpp

git-svn-id: svn://dev.exiv2.org/svn@3108 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3