Added transformer guessers
Removed validation for product attribute type
refactored imports
Refactored product importer
Merge branch 'feature/transformer_guessers' of github.com:akeneo/pim-community-dev into feature/transformer_guessers

Conflicts:
	src/Pim/Bundle/ImportExportBundle/Processor/ProductProcessor.php
	src/Pim/Bundle/ImportExportBundle/Transformer/LabelTransformer.php
Refactored product imports
Refactored product import
Refactored product importation
Fixed CS
Fixed CS
Fixed CS
Removed translator dependency from ImportValidator
Added DuplicateIdentifierException
Fixed CI
Fixed importation bugs
Removed association processor
Removed association processor
Fixed unit test on AttributeCache
Added AssociationTransformerInterface
Resolved bug with scopable non translatable attributes