support custom entity
Merge branch 'master' into fix/MC-21

* master:
  Update readme and changelog for RC6 #222
  Replaced productReader by bulk product reader #217

Conflicts:
	CHANGELOG.md
fix class detection
CHANGELOG update
Merge branch 'fix/MC19' into fix/MC-21

* fix/MC19:
  fix on indentation

Conflicts:
	Normalizer/ProductValueNormalizer.php
Merge pull request #227 from akeneo/fix/MC-21

Fix/mc 21 - custom entity support