Refactor the PDF generation behaviour into a separate bundle
fix style and html
Merge branch 'ass/jc_pim-3161' of github.com:akeneo/pim-community-dev into ass/jc_pim-3161

* 'ass/jc_pim-3161' of github.com:akeneo/pim-community-dev:
  Add or modify comments
  Refactor the PDF generation behaviour into a separate bundle
  PIM-3162 : replace slik/dompdf-bundle by the library and wrap directly in the builder

Conflicts:
	src/Pim/Bundle/EnrichBundle/Resources/views/Product/_buttons.html.twig
	src/Pim/Bundle/PdfGeneratorBundle/Builder/DompdfBuilder.php
	src/Pim/Bundle/PdfGeneratorBundle/Controller/ProductController.php
	src/Pim/Bundle/PdfGeneratorBundle/DependencyInjection/PimPdfGeneratorExtension.php
	src/Pim/Bundle/PdfGeneratorBundle/Resources/config/builders.yml