title: How do you drop a `references` column in rails 3.1?
body: <p>I've created a table with a <code>references</code> column in an earlier migration and now I would like to drop it. I know I can do a call to <code>remove_column</code> on the generated name, but is there a way to remove it using the the table name instead?</p>
  
  <p><code>remove_references :blah, :users</code> instead of <code>remove_column :blah, :user_id</code></p>