Description:
------------
I've been chilling around with the latest PHP features and noticed that there is 
something missing - there is no way to get the current namespace if inheriting 
some implementation, which limit us on some implementations.

For example, we have an abstract class in one namespace and adapter for the very 
same class in another namespace. If we try to use the __NAMESPACE__ within the 
abstract class, it uses its own one and not the one of the inheriting class. I've 
checked the documentation to find some notes on this one to no avail.

Test script:
---------------
<?php
namespace SomeNamespace {
	abstract class SomeAdapterAbstract {
		public function getNamespace() { 
			return __NAMESPACE__;
		}
	}
}

namespace SomeNamespace\Adapters {
	use \SomeNamespace\SomeAdapterAbstract;

	class SomeAdapter extends SomeAdapterAbstract {};

	$adapter = new SomeAdapter;

	var_dump($adapter->getNamespace());
}

Expected result:
----------------
nikola@nikola-pc:~$ php test2.php 
string(13) "SomeNamespace\Adapters"


Actual result:
--------------
nikola@nikola-pc:~$ php test2.php 
string(13) "SomeNamespace"