Description:
------------
getProperties() doesn't include "private" scoped properties from parent classes

Test script:
---------------
<?php
abstract class Foo {
    public  $a;
    protected $b;
    private $c;
}

class Bar extends Foo {
    public $d;
    protected $e;
    private $f;
}

$obj = new Bar;
$reflection = new ReflectionClass($obj);
$propertyList = $reflection->getProperties();

foreach ($propertyList as $property) {
    var_dump($property->getName());
}

Expected result:
----------------
string(1) "d"
string(1) "e"
string(1) "f"
string(1) "a"
string(1) "b"
string(1) "c"

Actual result:
--------------
string(1) "d"
string(1) "e"
string(1) "f"
string(1) "a"
string(1) "b"