title: "rails generate plugin" gives "Could not find generator plugin."
body: <p>I can't find a clear resource tell me how to generate a rails 3 plugin.
  When I run</p>
  
  <pre><code>rails generate plugin [your_plugin_name]
  </code></pre>
  
  <p>I got this error
      Could not find generator plugin.
  I think generating plugin skeleton have different command than this! but what is it?</p>