PIM-3227 : prepare the tag 1.2.7
Merge pull request #1617 from akeneo/prepare-tag-1.2.7

PIM-3227 : prepare the tag 1.2.7
PIM-3227 : update changelog
Merge branch 'master' into merge-1.2-fixes

Conflicts:
	src/Pim/Bundle/CatalogBundle/Version.php
Merge pull request #1618 from akeneo/merge-1.2-fixes

Merge 1.2 fixes