Update: SignalR 2.0.3 Migration; Noticeboards

Migrate all SignalR 1.x Persistent Connections to SignalR 2.x Hubs.
Abstracts ScheduledTaskStatus with core interface and adds a Mock for
optional status reporting. Noticeboards rewritten (with new theme) to be
more resilient and accurate.

Disco.BI/BI/DocumentTemplateBI/Importer/DocumentImporterCleanCacheJob.cs

@@ -12,7 +12,8 @@ namespace Disco.BI.DocumentTemplateBI.Importer
         
         public override bool SingleInstanceTask { get { return true; } }
         public override bool CancelInitiallySupported { get { return false; } }
-
+        public override bool LogExceptionsOnly { get { return true; } }
+        
         public override void InitalizeScheduledTask(DiscoDataContext Database)
         {
             // Trigger Daily @ 12:30am