Add a common IKubernetesObject interface, expose type metadata (#152)

* - Implement common interface across all Kubernetes elements
- Add ApiVersion, Kind and Group properties

* Add IKubernetesObject interface

* Regenerate code

* Fixup after rebase

* Fixes after rebase, make method names consistent

src/KubernetesClient/KubernetesObject.cs

@@ -11,7 +11,7 @@ namespace k8s
     /// and use the <see cref="ApiVersion"/> and <see cref="Kind"/> properties to get basic metadata about any Kubernetes object.
     /// You can then 
     /// </remarks>
-    public class KubernetesObject
+    public class KubernetesObject : IKubernetesObject
     {
         /// <summary>
         /// Gets or sets aPIVersion defines the versioned schema of this