Issue 1106 - Add currentVersion Pref and compareVersions API

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 74 matching lines @@
     FilterPtr Matches(const std::string& url,
         const std::string& contentType,
         const std::vector<std::string>& documentUrls) const;
     std::vector<std::string> GetElementHidingSelectors(const std::string& domain) const;
     JsValuePtr GetPref(const std::string& pref) const;
     void SetPref(const std::string& pref, JsValuePtr value);
     std::string GetHostFromURL(const std::string& url);
     void ForceUpdateCheck(UpdaterCallback callback = 0);
     void SetFilterChangeCallback(FilterChangeCallback callback);
     void RemoveFilterChangeCallback();
+    int CompareVersions(const std::string& v1, const std::string& v2);
 
   private:
     JsEnginePtr jsEngine;
     bool initialized;
     bool firstRun;
     int updateCheckId;
 
     void InitDone(JsValueList& params);
     FilterPtr CheckFilterMatch(const std::string& url,
                                const std::string& contentType,
                                const std::string& documentUrl) const;
     void UpdateCheckDone(const std::string& eventName, UpdaterCallback callback, JsValueList& params);
     void FilterChanged(FilterChangeCallback callback, JsValueList& params);
   };
 }
 
 #endif