title: hide and show a polyline in leaflet?
body: <p>I'm using leaflet for show raw itinerary to go to some markers.
  I'm showing my itinerary with a leaflet polyline.
  But I would like to be able to </p>
  
  <p>How to hide and show a polyline in leaflet ?</p>
  
  <p>I can do this :</p>
  
  <pre><code>$('.leaflet-overlay-pane').hide();
  </code></pre>
  
  <p>and </p>
  
  <pre><code>$('.leaflet-overlay-pane').show();
  </code></pre>
  
  <p>But this will show and hide all my polyline.
  I would like to be able to hide and show them separately.</p>
  
  <p>Thanks.</p>