add support for linkification of activity
add support for linkification of activity

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