Set default time zone to UTC

Author: ethanhann

IntegrationEngine.Model/CronTrigger.cs

@@ -7,6 +7,7 @@ public class CronTrigger : IHasStringId, IIntegrationJobTrigger
         public string Id { get; set; }
         public string JobType { get; set; }
         public string CronExpressionString { get; set; }
-        public TimeZoneInfo TimeZone { get; set; }
+        TimeZoneInfo _timeZone { get; set; }
+        public TimeZoneInfo TimeZone { get { return _timeZone ?? TimeZoneInfo.Utc; } set { _timeZone = value; } }
     }
 }