Fixed culture specific serialization issue of float and double.

Delimiter was removed when serializing a float or a double.
For example: 10.12 ended up as 1012.

Rhino.ServiceBus.Tests/XmlSerializerTest.cs

@@ -50,6 +50,30 @@ public void Can_serialize_and_deserialize_primitive()
             Assert.Equal(ticks, actual);
         }
 
+        [Fact]
+        public void Can_serialize_and_deserialize_double()
+        {
+            double aDouble = 1.12;
+            var serializer = new XmlMessageSerializer(new DefaultReflection(), new CastleServiceLocator(new WindsorContainer()));
+            var stream = new MemoryStream();
+            serializer.Serialize(new object[] { aDouble }, stream);
+            stream.Position = 0;
+            var actual = (double)serializer.Deserialize(stream)[0];
+            Assert.Equal(aDouble, actual);
+        }
+
+        [Fact]
+        public void Can_serialize_and_deserialize_float()
+        {
+            float aFloat = 1.12f;
+            var serializer = new XmlMessageSerializer(new DefaultReflection(), new CastleServiceLocator(new WindsorContainer()));
+            var stream = new MemoryStream();
+            serializer.Serialize(new object[] { aFloat }, stream);
+            stream.Position = 0;
+            var actual = (float)serializer.Deserialize(stream)[0];
+            Assert.Equal(aFloat, actual);
+        }
+
 		[Fact]
 		public void Can_serialize_and_deserialize_byte_array()
 		{

Rhino.ServiceBus/Serializers/XmlMessageSerializer.cs

@@ -271,7 +271,13 @@ private static string FormatAsString(object value)
 
             if (value is decimal)
                 return ((decimal) value).ToString(CultureInfo.InvariantCulture);
-
+
+            if (value is double)
+                return ((double)value).ToString(CultureInfo.InvariantCulture);
+
+            if (value is float)
+                return ((float)value).ToString(CultureInfo.InvariantCulture);
+
             return value.ToString();
         }