title: Gem.source_index is deprecated, use Specification. Should I re-install Gem or Rails?
body: <p>I'm learning RoR on Ubuntu 11. Got the following message when I was trying to generate an app. Did I install something incorrectly?</p>
  
  <pre><code>$ rails generate controller Pages home contact
  NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
  Gem.source_index called from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.12/lib/bundler/shared_helpers.rb:3.
  NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
  Gem.source_index called from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.12/lib/bundler/source.rb:162.
  NOTE: Gem::SourceIndex#each is deprecated with no replacement. It will be removed on or after 2011-11-01.
  Gem::SourceIndex#each called from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.12/lib/bundler/source.rb:162.
  NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
  Gem.source_index called from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.12/lib/bundler/shared_helpers.rb:84.
  </code></pre>