title: Cakephp3 Shell class for "Queue" could not be found
body: <p>Hi have one shell on cakephp3 and on my laptop its running well and its doing what is expected (the line used /Applications/MAMP/htdocs/page/bin/cake queue )</p>
  
  <p>Then i have push everting to server in ubuntu, update composer, the debug set to true, and i have run /var/www/html/api/bin/cake queue
  And this what i received:</p>
  
  <pre><code>&lt;?
  namespace App\Shell;
  
  use Cake\Console\Shell;
  use Cake\Mailer\Email;
  
  class QueueShell extends Shell
  {
  
      public function initialize()
  ...
  ...
  ...
      }
  }Exception: Shell class for "Queue" could not be found. in [/var/www/html/api/vendor/cakephp/cakephp/src/Console/ShellDispatcher.php, line 295]
  </code></pre>
  
  <p>I have change just for testing chmod of everting  to 777, but that didn't work.</p>
  
  <p>When i run /var/www/html/api/bin/cake it confirm that queue is there.</p>
  
  <pre><code>    Welcome to CakePHP v3.2.4 Console
  ---------------------------------------------------------------
  App : src
  Path: /var/www/html/api/src/
  PHP : 5.5.9-1ubuntu4.14
  ---------------------------------------------------------------
  Current Paths:
  
  * app:  src
  * root: /var/www/html/api
  * core: /var/www/html/api/vendor/cakephp/cakephp
  
  Available Shells:
  
  [Bake] bake
  
  [DebugKit] benchmark, whitespace
  
  [Migrations] migrations
  
  [CORE] i18n, orm_cache, plugin, routes, server
  
  [app] console, queue
  
  To run an app or core command, type `cake shell_name [args]`
  To run a plugin command, type `cake Plugin.shell_name [args]`
  To get help on a specific command, type `cake shell_name --help`
  </code></pre>
  
  <p>Someone have some suggestion what can be missing in the server, or to be changed?</p>
  
  <p>Thanks in advance</p>