[FIX] web_editor: video - allow to add video from unknown source

There are not cat... but you cannot know all the existing website in the world...
So, have faith in the user !

To do: allow to customize size or get it from iframe provided

addons/web_editor/static/src/js/widgets.js

@@ -836,6 +836,10 @@ function createVideoNode(url) {
         .attr('src', '//player.youku.com/embed/' + youkuMatch[1]);
     } else {
       // this is not a known video link. Now what, Cat? Now what?
+          $video = $('<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>')
+            .attr('width', '640')
+            .attr('height', '360')
+            .attr('src', url);
     }
 
     $video.attr('frameborder', 0);