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-3151: Add notification factory, manager and specs for it
Merge branch 'master' into fix/PIM-3121

Conflicts:
	CHANGELOG.md
Merge pull request #1433 from akeneo/fix/PIM-3121

Fixes memory leak on generic Doctrine Writer
Merge branch '1.2'
WIP first POC on product PDF generation
WIP add a compiler pass and tagged generators
WIP full template generation with tagged services
WIP fix comments and licenses throughout recently added files
Add missing queries in upgrade doc
WIP html template
Store username in job executions
WIP add PDF generation using DOMPDF bundle and library
PIM-3151: Add JobExecNotifier and update manager to be able to mark notif as viewed
WIP rename generators into renderers