Merge pull request #62 from akeneo/feature/attribute_mapping

Attribute export
PR comments corrections
PR comments corrections
Merge pull request #64 from akeneo/feature/mapping_for_everyone

Feature/mapping for everyone
Optimisation on webservice and validation
Merge branch 'master' into feature/specification

Conflicts:
	Mapper/MagentoCategoryMapper.php
Attribute normalizer specification