Description:
------------
Suppose MySQL database with a column of type bit(1).

Then fetching value from this column gives a binary string ("\0", "\1") in PHP5.3 
and numeric string ("0", "1") in 5.4.

I'd expect to obtain a boolean, but numeric string would be a good enough. But it 
must be consistent in both PHP versions.

Test script:
---------------
$res = $connection->query("SELECT * FROM bittest");
$row = $res->fetch();
dump($row);
Assert::same(0, $row->id);
Assert::same(false, $row->flag);

$row = $res->fetch();
dump($row);
Assert::same(1, $row->id);
Assert::same(true, $row->flag);


Expected result:
----------------
// 5.3.17
Nette\Database\Row(2) {
   id => 0
   flag => "\00"
}

Nette\Database\Row(2) {
   id => 1
   flag => "\01"
}


// PHP 5.4.7
Nette\Database\Row(2) {
   id => 0
   flag => "0"
}

Nette\Database\Row(2) {
   id => 1
   flag => "1"
}

Actual result:
--------------
Both PHP versions the same.