Added NightAlert project for travel kit

NightScout/Interfaces/IAlerter.cs

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+namespace NightScout
+{
+    public interface IAlerter
+    {
+        void StartAlert();
+        void StartUrgentAlert();
+        void StartStaleDataAlert();
+        void StopAlerts();
+    }
+}

NightScout/Interfaces/INightscoutDataSource.cs

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+using System;
+using Newtonsoft.Json.Linq;
+
+namespace NightScout
+{
+    public interface INightscoutDataSource
+    {
+        event Action Connected;
+        event Action<Object> DataUpdate;
+        event Action<Object> SocketError;
+        event Action<Object> Alarm;
+        event Action<Object> UrgentAlarm;
+        event Action<Object> ClearAlarm;
+        event Action StaleDataAlarm;
+        void Emit(String eventName, String data);
+        void Emit(String eventName, JObject data);
+        void Authorize();
+    }
+}

NightScout/Interfaces/IRaspberryPiButtonSource.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NightScout.Interfaces
+{
+    public interface IRaspberryPiButtonSource
+    {
+        event Action<Boolean> ButtonStateChange;
+    }
+}