Improved comments and made them proper xmldocs

Author: gmarz

src/Nest/Domain/ICustomJson.cs

@@ -2,12 +2,17 @@
 
 namespace Nest
 {
-	// If an object implements this then it can handle its own json representation
+	/// <summary>
+	/// If an object implements this then it can handle its own json representation
+	/// </summary>
 	public interface ICustomJson
 	{
 		object GetCustomJson();
 	}
 
-	// Any object that implements this will automatically be added to the serialization contract
+	/// <summary>
+	/// Any object that implements this interface will automatically have all 
+	/// JsonProperties of all of its implementing interfaces discovered.
+	/// </summary>
 	public interface INestSerializable { }
 }