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
Merge branch 'PIM-3131' of github.com:akeneo/pim-community-dev into PIM-3131
PIM-3134: added sequential edit progress bar
PIM-3134: clean twig and css code
WIP full template generation with tagged services
PIM 3134: inversed skip buttons label
Merge pull request #1450 from akeneo/PIM-3134

PIM-3134: added sequential edit progress bar
WIP fix comments and licenses throughout recently added files
PIM-3134: fixing less files and changed to use bootstrap grid system
Merge branch 'PIM-3131' of github.com:akeneo/pim-community-dev into PIM-3131
PIM-3148: Change routing and create new controller

Conflicts:
	src/Pim/Bundle/EnrichBundle/Controller/MassEditActionController.php
PIM-3133: Define repositories and managers
PIM-3133: Save sequential edit entity
PIM-3133: Move files from catalog to enrich bundle
Merge pull request #1449 from akeneo/PIM-3133

PIM-3133 : Save Sequential Edit entity
Merge pull request #1451 from akeneo/PIM-3134

PIM-3134: fixing less files and changed to use bootstrap grid system