Upgraded BatchBundle to dev branch
Added upgrade documentation
Fixed spec
Merge branch 'master' into task/batch_bundle_0.2

Conflicts:
	CHANGELOG.md
	composer.json
PIM-2900: Clean compiler pass
PIM-2900: Define serializer with normalizers for versioning
PIM-2900: Add serializer.yml in versioning bundle
PIM-2900: Define new serializer and update dependencies
PIM-2900: Fix issue and remove useless normalizers
PIM-2900: Remove useless service
PIM-2900: remove definition of useless services
PIM-2900: Refactor pim serializer resolver
PIM-2900: Add phpdoc
PIM-2900: Avoid service duplication
PIM-2900: Compiler pass throws exception when serializer is unknown
PIM-2900: Clean code line
PIM-2900: Add specs
PIM-2900: Remove useless UT
Switched to stable version of batch bundle
PIM-2960: Rename compiler pass