Using \Zend\Db\Sql\Expression as part of join name.  Object of class Zend\Db\Sql\Expression could not be converted to string

In ZF1 I could do this

``` php
$select->join(array('mytable' => new Zend_Db_Expr('psql_function_which_returns_table')), 'mytable.id = other_table.mytable_id', array(
    'mytable.col',
))
```

However in ZF2

``` php
$select->join(array('mytable' => new \Zend\Db\Sql\Expression('psql_function_which_returns_table')), 'mytable.id = other_table.mytable_id', array(
    'mytable.col',
))
```

Throws an Exception: Object of class Zend\Db\Sql\Expression could not be converted to string...

I have proivided a diff for Zend\Db\Sql\Select.php which will allow this use case.

``` diff
743c743,746
<             if ($joinName instanceof TableIdentifier) {

---
>             if ($joinName instanceof ExpressionInterface) {
>                 $joinName = $joinName->getExpression();
>             }
>             elseif ($joinName instanceof TableIdentifier) {
``
```


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Using \Zend\Db\Sql\Expression as part of join name. Object of class Zend\Db\Sql\Expression could not be converted to string #6082

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Using \Zend\Db\Sql\Expression as part of join name. Object of class Zend\Db\Sql\Expression could not be converted to string #6082

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