FIxed #132 - rendering inline images

Source/Basic Shapes/SvgImage.cs

@@ -250,8 +250,11 @@ namespace Svg
                 using (WebResponse webResponse = httpRequest.GetResponse())
                 {
                     using (var stream = webResponse.GetResponseStream())
+                    {
+                        if (stream.CanSeek)
                         {
                             stream.Position = 0;    
+                        }
                         if (uri.LocalPath.EndsWith(".svg", StringComparison.InvariantCultureIgnoreCase))
                         {
                             var doc = SvgDocument.Open<SvgDocument>(stream);