title: How to delete namespace in Google Cloud datastore
body: <p>I have a couple of Google App Engine versions in a project, and I use its Datastore. Each version creates a namespace on Datastore, where I have created some entities within a couple of kinds.</p>
  
  <p>Now I've deleted some of the versions, and I want to delete their stuff on Datastore. I've deleted the entities, then the referred kinds had disappeared, but I can't find a way to delete the namespaces.</p>
  
  <p>How can I delete a namespace in Google Cloud Datastore?</p>