Switch radio to checkbox in class manager view

package.json

@@ -1,7 +1,7 @@
 {
   "name": "grapesjs",
   "description": "Free and Open Source Web Builder Framework",
-  "version": "0.9.1",
+  "version": "0.9.2",
   "author": "Artur Arseniev",
   "license": "BSD-3-Clause",
   "homepage": "http://grapesjs.com",

src/selector_manager/view/ClassTagView.js

@@ -94,14 +94,17 @@ module.exports = Backbone.View.extend({
    * @private
    */
   updateStatus() {
+    var chkOn = 'fa-check-square-o';
+    var chkOff = 'fa-square-o';
+
     if(!this.$chk)
       this.$chk = this.$el.find('#' + this.pfx + 'checkbox');
 
     if(this.model.get('active')){
-      this.$chk.removeClass('fa-circle-o').addClass('fa-dot-circle-o');
+      this.$chk.removeClass(chkOff).addClass(chkOn);
       this.$el.removeClass('opac50');
     }else{
-      this.$chk.removeClass('fa-dot-circle-o').addClass('fa-circle-o');
+      this.$chk.removeClass(chkOn).addClass(chkOff);
       this.$el.addClass('opac50');
     }
   },