rails plugin new --mountable creates directories in user's home directory

I am trying to follow the guide by Piotr at http://piotrsarnacki.com/2010/12/21/mountable-apps-tutorial/ and generate a new Rails mountable app. When I run bundle exec ./bin/rails plugin new ../blog --edge --mountable, among the output is this line:

create  sers/vladimir/app/templates/public/javascripts

and after the command completes, there is an app directory in my home directory, totally outside the path given to rails plugin new.