Added asp.net tick timer

Added health monitoring
Updated database logging

NzbDrone.Core/WebTimer.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Web;
+using System.Web.Caching;
+using NLog;
+
+namespace NzbDrone.Core
+{
+    class WebTimer
+    {
+
+        private static CacheItemRemovedCallback _onCacheRemove;
+        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
+
+        public void StartTimer(int secondInterval)
+        {
+            _onCacheRemove = new CacheItemRemovedCallback(DoWork);
+
+            HttpRuntime.Cache.Insert(GetType().ToString(), secondInterval, null,
+                DateTime.Now.AddSeconds(secondInterval), Cache.NoSlidingExpiration,
+                CacheItemPriority.NotRemovable, _onCacheRemove);
+        }
+
+
+        public void DoWork(string k, object v, CacheItemRemovedReason r)
+        {
+            Logger.Info("Tick!");
+            StartTimer(Convert.ToInt32(v));
+        }
+    }
+}