minor #580 remove unused Doctrine/ORM/Configuration use statement in DoctrineHelper (jrushlow)

This PR was merged into the 1.0-dev branch.

Discussion
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remove unused Doctrine/ORM/Configuration use statement in DoctrineHelper

I think this slipped with PR #545 unintentionally... Causing tests to fail

Commits
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39247ec removed unused Doctrine/ORM/Configuration use statement

Author: weaverryan

src/Doctrine/DoctrineHelper.php

@@ -16,7 +16,6 @@
 use Doctrine\Common\Persistence\Mapping\Driver\MappingDriver as LegacyMappingDriver;
 use Doctrine\Common\Persistence\Mapping\MappingException as LegacyPersistenceMappingException;
 use Doctrine\DBAL\Connection;
-use Doctrine\ORM\Configuration;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Mapping\MappingException as ORMMappingException;
 use Doctrine\ORM\Mapping\NamingStrategy;