title: What the conceptual difference between tenant and namespace
body: <p>I'm faced with the tenant term a little time ago in context of Stormpath and after in context of Google Cloud Datastore. And what made me crazy about this, is why we where need to introduce new term to define a namespace? Or maybe I'm missing something that describes tenant's specific qualities that namespace doesn't have?</p>
  
  <p>And although, in this whole concept I'm still can't get the concept of the multitenancy here? What the point of multitenancy? It just looks like multinamespaces thing, but with the same structure.</p>
  
  <p>So, what the difference betwen this two terms?</p>