Fixes Strict error on EntityPersisterMock.

First tests for basic collection implementation. First experimental use of closures (Currently commented out, because the svn server makes a syntax check against 5.2.x).

added missing annotation driver class. small refactorings. added first ClassMetadata serialization tests.

Fixed paths that were referring wrong namespace resolution.
Implemented more Parser and AST classes: JoinVariableDeclaration and Join.
Fixed wrong semantical checks of IndexBy grammar rule. They should be in IdentificationVariableDeclaration and JoinVariableDeclaration.

Fixed wrong DQL in IdentifierRecognitionTest.php