(fixes #840) add op_link_to_member() unit test.
(fixes #840) add op_link_to_member() unit test.

balibali/KakiageSNS,upsilon/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/AuthFramework,kashiwasan/symfony-advanced,tejima/testravis,nise-nabe/ppcon-sns,upsilon/OpenPNE3,upsilon/travis-test,openpne/OpenPNE3,isaosano/OpenPNE3,openpne/OpenPNE3,tejima/testravis,C-nakajima/OpenPNE3,openpne/OpenPNE3,upsilon/travis-test,nise-nabe/ppcon-sns,openpne/OpenPNE3,C-nakajima/OpenPNE3,ShinichiU/AuthFramework,tejima/testravis,C-nakajima/OpenPNE3,kashiwasan/symfony-advanced,nishizoe/OpenPNE3,ShinichiU/OpenPNE3,tejima/OP3PKG,C-nakajima/OpenPNE3,isaosano/OpenPNE3,isaosano/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/AuthFramework,isaosano/OpenPNE3,balibali/KakiageSNS,nishizoe/OpenPNE3,tejima/OP3PKG