fix culture parsing

Author: tpluscode

src/JsonLD/Core/RDFDataset.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using JsonLD.Core;
 using Newtonsoft.Json.Linq;
 
@@ -220,7 +221,7 @@ internal virtual JObject ToObject(bool useNativeTypes)
                                 {
                                     try
                                     {
-                                        double d = double.Parse(value);
+                                        double d = double.Parse(value, CultureInfo.InvariantCulture);
                                         if (!double.IsNaN(d) && !double.IsInfinity(d))
                                         {
                                             if (JSONLDConsts.XsdInteger.Equals(type))
@@ -746,7 +747,7 @@ private RDFDataset.Node ObjectToRDF(JToken item)
                                 value = new JValue((double)number);
                             }
                             // canonical double representation
-                            return new RDFDataset.Literal(string.Format("{0:0.0###############E0}", (double)value), datatype.IsNull() ? JSONLDConsts.XsdDouble
+                            return new RDFDataset.Literal(string.Format(CultureInfo.InvariantCulture, "{0:0.0###############E0}", (double)value), datatype.IsNull() ? JSONLDConsts.XsdDouble
                                  : (string)datatype, null);
                         }
                         else