Configurable return 500 on exception in http handlers.

Configurable websocket hearbeat.
Nit fixes.

MTSC.UnitTests/RoutingModules/ExceptionThrowingModule.cs

@@ -0,0 +1,14 @@
+using MTSC.Common.Http;
+using MTSC.Common.Http.RoutingModules;
+using System.Threading.Tasks;
+
+namespace MTSC.UnitTests.RoutingModules
+{
+    public class ExceptionThrowingModule : HttpRouteBase
+    {
+        public override Task<HttpResponse> HandleRequest(HttpRequest request)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}