Firefox対応
Merge pull request #55 from hikarock/support-firefox

Firefox対応
Merge remote-tracking branch 'origin/master' into append-404-page
Merge remote-tracking branch 'origin/append-404-page' into append-404-page
Merge remote-tracking branch 'origin/append-404-page' into append-404-page
Merge remote-tracking branch 'origin/append-404-page' into append-404-page
Merge remote-tracking branch 'origin/append-404-page' into append-404-page
エラーページのマークアップ
ストボAPIが404を返した時は404ページに遷移する