[3.1.0.rc4] plugin installation

rails plugin install https://github.com/delynn/userstamp.git
/usr/lib/ruby/gems/1.8/gems/railties-3.1.0.rc4/lib/rails/commands/
plugin.rb:277: Commands is not a module (TypeError)
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:237:in `require'
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:237:in `require'
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:223:in `load_dependency'
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:639:in `new_constants_in'
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:223:in `load_dependency'
  from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0.rc4/lib/
active_support/dependencies.rb:237:in `require'
  from /usr/lib/ruby/gems/1.8/gems/railties-3.1.0.rc4/lib/rails/
commands.rb:28
  from script/rails:6:in `require'
  from script/rails:6

Anyone else able to install a plugin?

I can install this fine on 3.1.0.rc4 using Ruby 1.8.7 and rake 0.9.2.

This fails for me on Rails 3.0.9 and Rake 0.9.2

gems/railties-3.0.9/lib/rails/commands/plugin.rb:277: Commands is not a module (TypeError)

Using bundler

This fails for me on Rails 3.0.9 and Rake 0.9.2
gems/railties-3.0.9/lib/rails/commands/plugin.rb:277: Commands is not a
module (TypeError)

Using bundler

This issue is currently being discussed https://github.com/rails/rails/issues/1866

IMO this is more of rake issue, although it could easily be fixed with
rails as well. In the meantime, you can use an earlier version of rake.