Db order expressioninterface

[Pittiplatsch]

PR for #6719

[turrsis]

May be fix this for Select::quantifier() method too?

[Pittiplatsch]

If you could provide unit tests, extending quantifier()'s API should be trivial 👍

[turrsis]

    public function testQuantifierParameter()
    {
        $expr = $this->getMock('Zend\Db\Sql\ExpressionInterface');
        $select = new Select;
        $select->quantifier($expr);
        $this->assertSame(
            $expr,
            $select->getRawState(Select::QUANTIFIER)
        );
    }

[Ocramius]

@Pittiplatsch merged, thanks!

master: 530fab5
develop: 088c2ee