Fixes memory leak on generic Doctrine Writer

The writer uses now the ProductCacheClearer
PIM-2814 Fix page titles when product edit/mass edit form is submitted with errors
Update changelog
Merge pull request #1434 from akeneo/PIM-2814

PIM-2814 Fix page titles on product edit/mass edit pages when there are errors in the form
Revert "PIM-2814 Fix page titles on product edit/mass edit pages when there are errors in the form "
Merge pull request #1435 from akeneo/revert-1434-PIM-2814

Revert "PIM-2814 Fix page titles on product edit/mass edit pages when th...
Preparing 1.2.0 release
Merge pull request #1436 from akeneo/1-2-0

Preparing 1.2.0 release
Fix style and phpdoc
Clean up specs
Quote '@' characters in yaml
Merge pull request #1437 from akeneo/cleanup

Style and phpdoc fixes
Update CHANGELOG.md
Add notification entities, repository and specs
PIM-3132: Create button for sequential edition
added sequential edition backend storage entity
added sequential edition backend storage entity
CS fixe
PIM-3148: Create a mass action route for sequential edit
CS fixes