Implemented update checking functionality

lib/api.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 var API = (function()
 {
   var Filter = require("filterClasses").Filter;
   var Subscription = require("subscriptionClasses").Subscription;
   var SpecialSubscription = require("subscriptionClasses").SpecialSubscription;
   var FilterStorage = require("filterStorage").FilterStorage;
   var defaultMatcher = require("matcher").defaultMatcher;
   var ElemHide = require("elemHide").ElemHide;
   var Synchronizer = require("synchronizer").Synchronizer;
   var Prefs = require("prefs").Prefs;
+  var checkForUpdates = require("updater").checkForUpdates;
 
   return {
     getFilterFromText: function(text)
     {
       text = Filter.normalize(text);
       if (!text)
         throw "Attempted to create a filter from empty text";
       return Filter.fromText(text);
     },
 
@@ skipping 111 matching lines @@
     },
 
     getPref: function(pref)
     {
       return Prefs[pref];
     },
 
     setPref: function(pref, value)
     {
       Prefs[pref] = value;
+    },
+
+    forceUpdateCheck: function(eventName)
+    {
+      checkForUpdates(true, _triggerEvent.bind(null, eventName));
     }
   };
 })();