Implemented update checking functionality

lib/api.js

Index: lib/api.js
===================================================================
--- a/lib/api.js
+++ b/lib/api.js
@@ -20,16 +20,17 @@ 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);
@@ -151,11 +152,16 @@ var API = (function()
     getPref: function(pref)
     {
       return Prefs[pref];
     },
 
     setPref: function(pref, value)
     {
       Prefs[pref] = value;
+    },
+
+    forceUpdateCheck: function(eventName)
+    {
+      checkForUpdates(true, _triggerEvent.bind(null, eventName));
     }
   };
 })();