title: Override image_tag rails helper
body: <p>Is there a way to override the <code>image_tag</code> helper method located in the <code>asset_tag_helper.rb</code> in Rails 3.x?</p>
  
  <p>The goal is to automatically add a <code>data-fallback</code> with the <code>png</code> version of the image if the image extension is <code>svg</code>, to not have to do it manually all the time.</p>
  
  <p>I search but found nothing so far.</p>
  
  <p><strong>Edit</strong>:</p>
  
  <p>I found <a href="https://stackoverflow.com/questions/10471535/override-rails-helpers-with-access-to-original?rq=1">Override rails helpers with access to original</a> but it doesn't seem to be what I want, I would prefer to create my own class that extends Rails native helper and then override the method. Is that possible?</p>