Rename AbstractMedia to AbstractProductMedia
Fix Media normalize spec
Replace Media by ProductMedia
Fix specs for smart registry and product to flat array processors
Fix CS
Update the changelog
Merge branch 'master' into refactor/product_media
Merge pull request #1303 from akeneo/refactor/product_media

Rename media
Merge branch 'master' into refactor/metric-transformer

Conflicts:
	CHANGELOG.md
	src/Pim/Bundle/CatalogBundle/Resources/config/entities.yml