Allow spans in editable html

The Medium Editor puts invisible spans in various places, don't remove
them.

Author: jjeffryes

js/utils/validateMediumEditor.js

@@ -19,8 +19,7 @@ function checkVal($field) {
   fVal = decodeHtml(fVal);
 
   fVal = sanitizeHTML(fVal, {
-    allowedTags: [ 'h2','h3', 'h4', 'h5', 'h6', 'p', 'a','u','ul', 'ol', 'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'hr', 'br', 'img', 'blockquote' ],
-    //allowedTags: [ 'h2','h3', 'h4', 'h5', 'h6', 'p','u','ul', 'ol', 'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'hr', 'br', 'blockquote' ],
+    allowedTags: [ 'h2','h3', 'h4', 'h5', 'h6', 'p', 'a','u','ul', 'ol', 'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'hr', 'br', 'img', 'blockquote', 'span' ],
     allowedAttributes: {
       'a': [ 'href', 'title', 'alt' ],
       'img': [ 'src', 'style']
@@ -29,7 +28,6 @@ function checkVal($field) {
       return frame.tag === 'p' && !frame.text.trim();
     }
   });
-
 
   $field.val(fVal);