PIM-3443: Fix prices export and add spec
Merge pull request #1855 from akeneo/PIM-3443-2

PIM-3443: Fix prices export and add spec
Merge branch 'PIM-3443-2' into PIM-3443-merge

Conflicts:
	CHANGELOG.md
	spec/Pim/Bundle/TransformBundle/Normalizer/Flat/ProductNormalizerSpec.php
PIM-3443: Fix following the merge
Merge pull request #1856 from akeneo/PIM-3443-merge

PIM-3443 : merge from 1.2
PIM-3446: limit the warning display to 100 in import/export
PIM-3406: change data normalization for mongo
Merge branch 'PIM-3446' into PIM-3446-merge
Merge pull request #1858 from akeneo/PIM-3446-merge

PIM-3446 merge to master
PIM-3371 : fix invalid metric values in installer fixtures
Merge pull request #1861 from akeneo/PIM-3371-fix-installer

PIM-3371 : fix invalid metric values in installer fixtures
Merge pull request #1834 from akeneo/PIM-3406-merge

PIM-3406: change data normalization for mongo
PIM-3392 Update family filter to use operator when filtering by empty
Merge pull request #1862 from akeneo/PIM-3392

PIM-3392 Update family filter to use operator when filtering by empty
PIM-3371 : add extra attributes and fix product data set
PIM-3371 : re-work products demo set to add attributes
PIM-3371 : update icecat_demo_dev fixtures
PIM-3371 : all attributes are useable as filters in data set
PIM-3371 : fix attribute options
Merge pull request #1865 from akeneo/PIM-3371-update-installer

PIM-3371 update installer