title: Adding filename to Rails logger info messages
body: <p>How to add the file name and line number in Rails' log message? My current format is something like</p>
  
  <pre><code>[INFO : 12-09-27 10:12:30]
  </code></pre>
  
  <p>I want to change it to</p>
  
  <pre><code>[INFO: 12-09-27 10:12:30 application_controller.rb:35]
  </code></pre>
  
  <p>or something like this. Any ideas?</p>