Changed folder structure, added explicit nullable for extensions.

Extensions/Cloudflare.Zones/Models/Nameserver.cs

@@ -0,0 +1,22 @@
+namespace AMWD.Net.Api.Cloudflare.Zones
+{
+	/// <summary>
+	/// A nameserver.
+	/// </summary>
+	public class Nameserver
+	{
+		/// <summary>
+		/// The nameserver type.
+		/// </summary>
+		[JsonProperty("type")]
+		public virtual NameserverType Type { get; set; }
+
+		// TODO: DEPRECATED? - not available on API request.
+		///// <summary>
+		///// Configured nameserver set to be used for this zone.
+		///// </summary>
+		///// <value>Range: <c>1 &lt;=</c> X <c>&lt;= 5</c></value>
+		//[JsonProperty("ns_set")]
+		//public virtual int NameserverSet { get; set; }
+	}
+}