Irwi is not downward compatible with Rails 2.x any more
Irwi is not downward compatible with Rails 2.x any more

* therefore drop mention of RoR 2.x problems from the README
* note that irwi is a RoR 3 plugin

alno/irwi,ChaeMingyun/irwi,ChaeMingyun/irwi,alno/irwi