Reorganize solution structure.

Source/MQTTnet/Exceptions/MqttCommunicationException.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace MQTTnet.Exceptions
+{
+    public class MqttCommunicationException : Exception
+    {
+        protected MqttCommunicationException()
+        {
+        }
+
+        public MqttCommunicationException(Exception innerException)
+            : base(innerException.Message, innerException)
+        {
+        }
+
+        public MqttCommunicationException(string message)
+            : base(message)
+        {
+        }
+    }
+}

Source/MQTTnet/Exceptions/MqttCommunicationTimedOutException.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace MQTTnet.Exceptions
+{
+    public class MqttCommunicationTimedOutException : MqttCommunicationException
+    {
+        public MqttCommunicationTimedOutException()
+        {
+        }
+
+        public MqttCommunicationTimedOutException(Exception innerException) : base(innerException)
+        {
+        }
+    }
+}

Source/MQTTnet/Exceptions/MqttProtocolViolationException.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace MQTTnet.Exceptions
+{
+    public class MqttProtocolViolationException : Exception
+    {
+        public MqttProtocolViolationException(string message)
+            : base(message)
+        {
+        }
+    }
+}