Modified a unit test to fail due to issue #10 (serializing decimal types)

Fixed issue #10 which prevented the serialization of C# decimal types

Martin Evans <martindevans@gmail.com>

SharpYaml.Tests/Serialization/SerializationTests2.cs

@@ -203,7 +203,9 @@ Value: World!
 
 			public ulong UInt64 { get; set; }
 
-			public float Float { get; set; }
+		    public decimal Decimal { get; set; }
+
+		    public float Float { get; set; }
 
 			public double Double { get; set; }
 
@@ -235,6 +237,7 @@ ArrayContent: [1, 2]
 Bool: true
 BoolFalse: false
 Byte: 2
+Decimal: 4623451.0232342352463856744563
 Double: 6.6
 Enum: B
 EnumWithFlags: A, B

SharpYaml/Serialization/Serializers/PrimitiveSerializer.cs

@@ -235,7 +235,7 @@ namespace SharpYaml.Serialization.Serializers
                         text = AppendDecimalPoint(((double)value).ToString("R", CultureInfo.InvariantCulture));
 						break;
 					case TypeCode.Decimal:
-                        text = AppendDecimalPoint(((decimal)value).ToString("R", CultureInfo.InvariantCulture));
+                        text = AppendDecimalPoint(((decimal)value).ToString(CultureInfo.InvariantCulture));
 						break;
 					case TypeCode.DateTime:
 						text = ((DateTime) value).ToString("o", CultureInfo.InvariantCulture);