Describe archive upload and import scenario
Allow uploading a zip archive when importing data
Merge branch 'master' into PIM-1435
Update scenario for uploading and importing an archive
Update scenario for uploading an archive to import
Merge branch 'master' into PIM-1435
Move archive extraction to a dedicated method
Update changelog
Improve the upload and import process
Merge branch 'master' into PIM-1435

Conflicts:
	CHANGELOG.md
Restore empty value checking in FileValidator
Merge pull request #472 from akeneo/PIM-1435

Allow uploading and importing a zip archive with csv and media