title: Default task for namespace in Rake
body: <p>Given something like:</p>
  
  <pre><code>namespace :my_tasks do
    task :foo do
      do_something
    end
  
    task :bar do
      do_something_else
    end
  
    task :all =&gt; [:foo, :bar]
  end
  </code></pre>
  
  <p>How do I make <code>:all</code> be the default task, so that running <code>rake my_tasks</code> will call it (instead of having to call <code>rake my_tasks:all</code>)?</p>