TopicのcontensをｓｔｒｉｎｇからTextに変更
Merge pull request #83 from tamuratt/develop

TopicのcontensをstringからTextに変更
Merge branch 'develop' of http://github.com/ttamura204/pjSearch into staging
Merge branch 'staging' of http://github.com/ttamura204/pjSearch