MC-100: Update attribute reader, add a param in query and class doc
MC-100: UPdate for PR
Merge pull request #306 from akeneo/MC-100

MC-100: Process and normalize attribute to ApiImport format
Merge branch '2.0' into MC-102
Merge pull request #310 from akeneo/MC-102

MC-102: Add writer to send attributes to Magento
Merge branch '2.0' into MC-72

Conflicts:
	Helper/AttributeMappingHelper.php
	Normalizer/AttributeNormalizer.php
	Normalizer/ProductLabelDictionary.php
MC-72: Add specs