Test are for fix of ticket DDC-3028

Added 3 tests that check regression for:
- columnPrefix is empty
- columnPrefix is a string
- columnPrefix is false

Added some small entity / embeddable classes to support the test cases.

tests/Doctrine/Tests/ORM/Functional/ValueObjectsTest.php

@@ -180,8 +180,6 @@ class ValueObjectsTest extends \Doctrine\Tests\OrmFunctionalTestCase
         ));
     }
 
-
-
     public function testInlineEmbeddableWithPrefix()
     {
         $expectedColumnName = 'foobar_id';
@@ -214,8 +212,6 @@ class ValueObjectsTest extends \Doctrine\Tests\OrmFunctionalTestCase
 
         $this->assertEquals($expectedColumnName, $actualColumnName);
     }
-
-
 }