Fix Issue 57:	Oracle TopicModel.topicPosters missing user_twitter column
Fix Issue 57:	Oracle TopicModel.topicPosters missing user_twitter column
ittarvin/jforum2,tectronics/jforum2,tectronics/jforum2,linda1890/jforum2,denghuafeng/jforum2,ittarvin/jforum2,ittarvin/jforum2,tectronics/jforum2,linda1890/jforum2,linda1890/jforum2,denghuafeng/jforum2,denghuafeng/jforum2