fix(Pandoc): Enable raw_attribute in markdown.

Enabling this makes the way I write pages more functional inside of
pandoc.

In future I may add some way of allowing users to provide pandoc
arguments.

SiteFile/SiteFile.ConverterFunctions.cs

@@ -150,6 +150,7 @@ public static class Conversions{
 			Log.Warning("Pandoc template for {file} not found",file.Name);
 		}
 
+		pandocArgs += " --from markdown+raw_attribute ";
 		if (!Directory.Exists(Path.GetDirectoryName(GetNewName(file,settings,".html"))))
 		{
 		   Directory.CreateDirectory(Path.GetDirectoryName(GetNewName(file,settings,".html"))!);