Removed abstract classes
Added cache reader
Refactored product associations
Added product associations fixture
Fixed PHPDoc
Corrected unit tests
Corrected unit tests
Added test
Added product associations fixture
Fixed CS
Merge branch 'master' into task/refactor_import

Conflicts:
	src/Pim/Bundle/ImportExportBundle/Resources/config/readers.yml
Updated changelog
Added PHPDoc
Fixed CS
Merge pull request #622 from akeneo/task/refactor_import

Task/refactor import