DynamicDictionary Get should deal with nullables

Author: Mpdreamz

src/Elasticsearch.Net/Responses/Dynamic/DynamicValue.cs

@@ -474,14 +474,17 @@ private static object GetDynamicMember(object obj, string memberName)
 		/// <returns>If value is not null, value is returned, else default value is returned</returns>
 		public T TryParse<T>(T defaultValue = default(T))
 		{
+			var type = typeof(T);
+			if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
+				type = type.GenericTypeArguments[0];
+
 			if (HasValue)
 			{
 				try
 				{
 					if (_value.GetType().IsAssignableFrom(typeof(T)))
 						return (T)_value;
 
-					var type = typeof(T);
 					var stringValue = _value as string;
 
 					if (type == typeof(DateTime))

src/Tests/Tests/ClientConcepts/LowLevel/LowLevelResponseTypes.doc.cs

@@ -31,6 +31,7 @@ public static string Response()
 			return @"{
 			""boolean"" : true,	
 			""string"" : ""v"",
+			""number"" : 29,
 			""array"" : [1, 2, 3, 4],
 			""object"" : {
 				""first"" : ""value1"",
@@ -81,6 +82,10 @@ [U] public void DynamicResponse()
 
 			response.Get<int>("array.1").Should().Be(2);
 			response.Get<long>("array.1").Should().Be(2);
+			response.Get<long>("number").Should().Be(29);
+			response.Get<long?>("number").Should().Be(29);
+			response.Get<long?>("number_does_not_exist").Should().Be(null);
+			response.Get<long?>("number").Should().Be(29);
 
 			response.Get<string>("array_of_objects.1.second").Should()
 				.NotBeEmpty()