How to change Rails App name

1. First change all app old name to new name under app folder. 

2. Then change web server config under web server config file, like  sudo vi /opt/nginx/conf/nginx.conf

3. change database name

 3.1 change database name in your database system, like mysql

 3.2 use rake db:reset to drop old and create new. 

4. restart your nginx with 

/etc/init.d/nginx stop

/etc/init.d/nginx start