[2.0][DC-460] Refactored cache bulk deletion methods to use driver specific features to retrieve list of keys. Also, refactored tests
so that all methods are tested for all drivers.

Removed:

- Doctrine\Common\Cache\AbstractCache::count()
- Doctrine\Common\Cache\AbstractCache::deleteAll()

API Changes:

- Doctrine\ORM\AbstractQuery::getResultCacheId() now public

Bugs fixed:

- Doctrine\Common\Cache\AbstractCache::deleteByPrefix() was deleting _every_ key in cache

[2.0] DDC-278 - Add missing "columnDefinition" attribute to field tag of XML Schema for Doctrine Mapping.

[2.0] DDC-277 - Remove support "default" option in metadata mappings, but keep it as a concept in DBAL layer to support for example versionable entities.

[2.0] DDC-277 - Remove support "default" option in metadata mappings, but keep it as a concept in DBAL layer to support for example versionable entities.

[2.0] DDC-92 - Refactored Doctrine\DBAL\DriverManager some more in regards to exceptions and added some more test-cases.

[2.0] DDC-92 - Removed DoctrineException from Doctrine\DBAL\DriverManager and replaced with more specific DBALException's

[2.0] DDC-200 Implemented support for @columnDefinition - even with support to pass the definition to join columns if necessary for relations.

DDC-179 - Fixed issue with persistance of date fields by moving ! operator to the convertToPhpValue method.

[2.0][DDC-249] Fixed issue that documentation refers QueryBuilder::select() supports array, but it was only restricted to strings.

[2.0][DDC-249] Fixed issue that documentation refers QueryBuilder::select() supports array, but it was only restricted to strings.

[2.0][DDC-254] Improved MappingException thrown on missing required configuration of Many-Many mapping

DDC-179 - Use ! modifier in Date Format to reset all non-date parts to zero unix timestamp values, i.e. H:i:s => '00:00:00' always