Separate the QueryBuilder or use Doctrine class

[devsdmf]

Implement the use of an enhanced query builder, Doctrine have a powerful class for it, but it not support inserts until 2.4, since 2.5 the support was implemented, but the minimal dependency is 2.4 to support frameworks like a Symfony 2.3 and DoctrineBundle that uses the Doctrine 2.4, then, separate the actual query builder in a simple QueryBuilder class and if the Doctrine version is greater than or equal 2.5, uses the Doctrine QueryBuilder.