title: Symfony3 error Namespace does not contain any mapped entities
body: <p>I tried generate getters and setters in Symfony 3.0.1</p>
  
  <p>when i run command </p>
  
  <pre><code>php bin/console doctrine:generate:entities VendorName/MyBundle/EntityName
  </code></pre>
  
  <p>i have error</p>
  
  <pre><code>Namespace "VendorName\MyBundle\EntityName" does not contain any mapped entities.
  </code></pre>
  
  <p><strong>where is the mistake?</strong></p>
  
  <p><strong>Edit-1:</strong> First generate entity with YAML format</p>
  
  <p><strong>Edit-2:</strong> I tried generate getters and setters for vendor bundle</p>
  
  <p>Also i try with command <strong>php bin/console doctrine:generate:entities VendorNameMyBundle:EntityName</strong> and have another error:  </p>
  
  <pre><code>Can't find base path for "VendorName\MyBundle\Entity\EntityName" (path: "/home/site/vendor/vendorname/mybundle/Entity", destination: "/home/site/vendor/vendorname/mybundle/Entity").  
  </code></pre>