fix(Hydrator): Array hydration having always primary key and selected relations

[alquerci]

Fixes #134

[alquerci]

After revert #109
We got this failing tests see

Doctrine_Ticket_585_TestCase : method test_hydrateArray_withAllColumnsAliased_thenResultsHasAllRecords failed on line 68 
 Value1: array (
  0 => 'aliasId',
  1 => 'aliasName',
) 
 != 
 Value2: array (
  0 => 'id',
  1 => 'aliasName',
  2 => 'aliasId',
) 

Doctrine_Ticket_GH134_TestCase : method test_hydrateArray_withAllColumnsAliased_thenResultsHasAllRecords failed on line 49 
 Value1: array (
  0 => 'id',
  1 => 'aliasAddress',
) 
 != 
 Value2: array (
  0 => 'id',
  1 => 'aliasAddress',
  2 => 'Email',
) 

[alquerci]

On previous behaviour the array hydration relation have the identifier, even if not explicitly given on DQL, 8aef340

SELECT
    rootAlias.id,
    relationAlias.field
FROM RootRecord rootAlias
INNER JOIN RelationRecord relationAlias

After array hydration

- id: 'some-root-record-id'
  RelationName:
    id: 'some-relation-record-id'
    field: 'some_relation_field_value'

So there is another rule not frozen by the actual test suite.

On Array hydration identifier of the relation is always present even when not explicitly on DQL select.