Fix missing getter for private field test for PropertyAccess 2.3+

See: https://github.com/symfony/PropertyAccess/commit/df67239b02a9cef12cf84579f6cf569680298238
Merge pull request #338 from FriendsOfSymfony/2.0.x-property-access

Fix missing getter for private field test for PropertyAccess 2.3+
Merge branch '2.0.x' into 2.1.x

Conflicts:
	Tests/Transformer/ModelToElasticaAutoTransformerTest.php
Fix expected exception class (related to #338)

This corrects a typo in a66a37aebd7424e9a82e81bd1a3760abb735ea7e.
Merge branch '2.0.x' into 2.1.x

Conflicts:
	Tests/Transformer/ModelToElasticaAutoTransformerTest.php
Merge branch '2.1.x'

Conflicts:
	Tests/Transformer/ModelToElasticaAutoTransformerTest.php