Rails: freeze 将源码加入工程

将Rails源码加入工程可以使用freeze命令：

1. 进入工程目录
2. 使用rake rails:freeze:gems，可将源码解压到工程目录的vendor/rails目录下
3. 使用rake rails:unfreeze，可将解压的源码删除
4. freeze相关的task包括
   $ rake -T freezerake rails:freeze:edge # Lock to latest Edge Rails, for a specific release use RELEASE=1.2.0rake rails:freeze:gems # Lock this application to the current gems (by unpacking them into vendor/rails)rake rails:unfreeze # Unlock this application from freeze of gems or edge and return to a fluid use of system gems