title: Show runtime for each rspec example
body: <p>currently I'm running more than 1k examples and it's taking a long time to complete (more than <strong>20 minutes!!!</strong>).</p>
  
  <p>I'd like to identify which examples are the ones taking more time to complete, is there any way to run rspec and return the time each example takes to complete(individually)? I'm using <strong>rspec 1.3.0</strong> and <strong>rspec-rails 1.2.3</strong></p>