Update improvements

Include NzbDrone.Update in mono/osx package
Do not ignore certificate warnings for services
Check hash before extracting update
New: Update support for Linux/OS X - see the wiki for more information

src/NzbDrone.Core/Configuration/IConfigService.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using NzbDrone.Core.MediaFiles;
+using NzbDrone.Core.Update;
 
 namespace NzbDrone.Core.Configuration
 {
@@ -23,7 +24,6 @@ namespace NzbDrone.Core.Configuration
         Int32 BlacklistRetryInterval { get; set; }
         Int32 BlacklistRetryLimit { get; set; }
 
-
         //Media Management
         Boolean AutoUnmonitorPreviouslyDownloadedEpisodes { get; set; }
         String RecycleBin { get; set; }