make full icon class configurable

Author: bbrala

src/jquery.contextMenu.js

@@ -1105,8 +1105,12 @@ var // currently active contextMenu trigger
 
                     // add icons
                     if (item.icon) {
-                        item._icon = ($.isFunction(item.icon)) ? item.icon.call(this, $t, key, item) : item.icon;
-                        $t.addClass("icon icon-" + item._icon);
+                        if($.isFunction(item.icon)){
+                            item._icon = item.icon.call(this, $t, key, item)
+                        } else {
+                            item._icon = "icon icon-" + item.icon;
+                        }
+                        $t.addClass(item._icon);
                     }
                 }
 
@@ -1189,9 +1193,9 @@ var // currently active contextMenu trigger
                 $item[disabled ? 'addClass' : 'removeClass']('disabled');
 
                 if ($.isFunction(item.icon)) {
-                    $item.removeClass("icon-" + item._icon);
+                    $item.removeClass(item._icon);
                     item._icon = item.icon.call(this, $trigger, key, item);
-                    $item.addClass("icon-" + item._icon);
+                    $item.addClass(item._icon);
                 }
 
                 if (item.type) {