Issue 1515 - Mention dynamic properties in the Filter and Subscription docs

include/AdblockPlus/FilterEngine.h

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 #include <AdblockPlus/JsValue.h>
 
 #include "tr1_memory.h"
 
 namespace AdblockPlus
 {
   class FilterEngine;
 
   /**
    * Wrapper for an Adblock Plus filter object.
+   * There are no accessors for most
+   * [filter properties](https://adblockplus.org/jsdoc/adblockplus/symbols/Filter.html),
+   * use `GetProperty()` to retrieve them by name.
    */
   class Filter : public JsValue,
                  public std::tr1::enable_shared_from_this<Filter>
   {
   public:
     /**
      * Filter types, see https://adblockplus.org/en/filters.
      */
     enum Type {TYPE_BLOCKING, TYPE_EXCEPTION,
                TYPE_ELEMHIDE, TYPE_ELEMHIDE_EXCEPTION,
@@ skipping 27 matching lines @@
      * Creates a wrapper for an existing JavaScript filter object.
      * Normally you shouldn't call this directly, but use
      * FilterEngine::GetFilter() instead.
      * @param value JavaScript filter object.
      */
     Filter(JsValuePtr value);
   };
 
   /**
    * Wrapper for a subscription object.
+   * There are no accessors for most
+   * [subscription properties](https://adblockplus.org/jsdoc/adblockplus/symbols/Subscription.html),
+   * use `GetProperty()` to retrieve them by name.
    */
   class Subscription : public JsValue,
                        public std::tr1::enable_shared_from_this<Subscription>
   {
   public:
     /**
      * Checks if this subscription has been added to the list of subscriptions.
      * @return `true` if this subscription has been added.
      */
     bool IsListed();
@@ skipping 275 matching lines @@
                                ContentType contentType,
                                const std::string& documentUrl) const;
     void UpdateAvailable(UpdateAvailableCallback callback, JsValueList& params);
     void UpdateCheckDone(const std::string& eventName,
                          UpdateCheckDoneCallback callback, JsValueList& params);
     void FilterChanged(FilterChangeCallback callback, JsValueList& params);
   };
 }
 
 #endif