Implement simplified commercials workflow

It's now possible to simply enter the url of the third party provider to enter a commercial.

app/assets/javascripts/application.js

@@ -37,6 +37,7 @@
 //= require bootstrap-switch
 //= require osem-switch
 //= require osem-bootstrap
+//= require osem-commercials
 
 $(document).ready(function() {
     $('a[disabled=disabled]').click(function(event){

app/assets/javascripts/osem-commercials.js

@@ -0,0 +1,17 @@
+$(function () {
+    $(document).ready(function() {
+        $('#commercial_url').focusout(function(){
+            var url = $('#new_commercial').attr('action');
+            url = url + '/get_html'
+            $.ajax({
+                method: 'GET',
+                url: url,
+                data: { url: $(this).val() }
+            })
+                .done(function( msg ) {
+                    $('#resource-content').html(msg);
+                });
+        });
+    });
+});
+