add license notations (fixes #2756)
add license notations (fixes #2756)

upsilon/travis-test,kashiwasan/symfony-advanced,isaosano/OpenPNE3,nishizoe/OpenPNE3,ShinichiU/OpenPNE3,C-nakajima/OpenPNE3,kashiwasan/symfony-advanced,isaosano/OpenPNE3,upsilon/travis-test,ShinichiU/OpenPNE3,nishizoe/OpenPNE3,C-nakajima/OpenPNE3,C-nakajima/OpenPNE3,isaosano/OpenPNE3,isaosano/OpenPNE3,C-nakajima/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/OpenPNE3