Merge pull request #15 from hlee/master

Procfile change
Merge pull request #16 from hlee/master

Added Gemfile.lock for deploy heroku only and modify readme
完成room的增删改查
Merge pull request #18 from songjiayang/master

基本完成room的增删改查
完成在线人数和留言条数统计
Merge pull request #19 from songjiayang/master

完成在线统计和数据持久化
添加喜欢和取消喜欢功能
修改在线统计的bug
Merge pull request #21 from songjiayang/master

完成喜欢功能，查询功能
update for heroku deploy