Revert "added migration file. (fixes #1602)"
Revert "added migration file. (fixes #1602)"

This reverts commit 2f4eb182ecd04fb9460ddb582b6bd97d4ede9164.

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