DDC-3120 - adding instantiator dependency
DDC-3120 - add failing test for un-serialization of an internal PHP class
DDC-3120 - add failing test for un-serialization of an internal PHP class from cached metadata instance
DDC-3120 - need to wakeup reflection BEFORE using any `ClassMetadata` API
DDC-3120 - using `Doctrine\Instantiator` when building new instances
DDC-3120 - requiring `doctrine\instantiator:~1.0.1` as of doctrine/instantiator#4
fix DocBlock
improve schema validator error message for invalid bi-directional relations
Merge pull request #1121 from deeky666/DDC-3274

[DDC-3274] Improve schema validator error message for invalid bi-directional relations
Adding test to verify SQL generation with an expression in `COUNT()`
Allowing expression in `COUNT()` DQL aggregation functions
Adding DDC-3276 test group
DDC-3276 - #1122 - updating EBNF in docblock to reflect new syntax support
DDC-3276 - #1122 - updating EBNF in documentation to reflect new syntax support
Merge pull request #1122 from Ocramius/feature/support-arithmetic-expressions-in-count

Support arithmetic expressions in `COUNT()`
Fixed the structure of the reverse-engineered mapping
Fixed the test expectations for the DatabaseDriver
Merge pull request #1109 from doctrine/hotfix/DDC-3120-php-5.6-RC3-compat

DDC-3120 - PHP 5.6-RC3 compatibility
Update improving-performance.rst
add a link to said chapter