Fix DDC-2478
Implemented support for RepositoryFactory.
Merge pull request #694 from FabioBatSilva/DDC-2478

[DDC-2478] Support null association comparison
Fixed wrong interface.
Reducing dependency on RepositoryFactory by providing EntityManager as a getRepository argument.
Reduced granularity of DefaultRepositoryFactory reference to ObjectRepository instances, in cases where consumers are completely rewrote EntityRepository.
Fix phpDoc syntax in ClassMetadataInfo.php
Merge pull request #697 from michaelperrin/patch-1

Fix phpDoc syntax in ClassMetadataInfo.php
Updated since php doc tag.
Merge pull request #695 from doctrine/RepositoryFactory

Implemented support for RepositoryFactory.
Update getting-started.rst

The tutorial assumes Doctrine 2.4
Merge pull request #700 from rbroen/patch-2

Update getting-started.rst
list_bugs.php needs to call to getters for protected vars

list_bugs.php needs to call to getters for protected vars. This was changed in the "getting-started" code repository, but not in the "getting-started" tutorial.
Merge pull request #701 from rbroen/patch-2

list_bugs.php needs to call to getters for protected vars