Description:
------------
The script works as expected when not using namespace.  I get a fatal error on my "class SimpleCommand extends Notifier implements ICommand, INotifier" declaration.

Test script:
---------------
namespace org\puremvc\php\interfaces;
interface ICommand
{
  function execute(INotification $notification);
}
interface INotifier
{
  function sendNotification($notificationName, $body = null, $type = null);
}
namespace org\puremvc\php\patterns\observer;
use org\puremvc\php\interfaces\INotifier;
class Notifier implements INotifier
{
  public function __construct() { echo __METHOD__; }
  public function sendNotification($notificationName, $body = null, $type = null) { }
}
namespace org\puremvc\php\patterns\command;
use org\puremvc\php\interfaces\ICommand;
use org\puremvc\php\interfaces\INotifier;
use org\puremvc\php\patterns\observer\Notifier;
class SimpleCommand extends Notifier implements ICommand, INotifier
{
  public function __construct() { parent::__construct(); echo ' -> ';  echo __METHOD__; }
  function execute(INotification $notification) { }
}

echo '<br/>'; new \org\puremvc\php\patterns\observer\Notifier();
echo '<br/>'; new \org\puremvc\php\patterns\command\SimpleCommand();

Expected result:
----------------
org\puremvc\php\patterns\observer\Notifier::__construct
org\puremvc\php\patterns\observer\Notifier::__construct -> 
org\puremvc\php\patterns\command\SimpleCommand::__construct

Actual result:
--------------
Fatal error: Declaration of org\puremvc\php\patterns\command\SimpleCommand::execute() must be compatible with that of org\puremvc\php\interfaces\ICommand::execute() on line 21