Preparing version 1.2.15
Merge pull request #1877 from akeneo/PIM-3475

PIM-3475: Fix attribute options sort order in import/export
PIM-3447 Enforce max database length limit on text attribute values
PIM-3447 Update changelog
Merge pull request #1890 from akeneo/PIM-3447

PIM-3447 Enforce max database length limit on text attribute values
PIM-3471 : Add an error log when the max number of indexes is reached
for mongo product collection
PIM-3369: import products - couple channel/locale doesn't exist - the import succeeds
Merge pull request #1894 from akeneo/PIM-3471-mongo-indexes

PIM-3471 : add a error log when we reach the max indexes of a mongo collection
PIM-3369: add behat for import
PIM-3447 Fix behat scenario
Merge branch 'PIM-3369' into 1.2

Conflicts:
	CHANGELOG.md
PIM-3368: Fix association transformer
Merge pull request #1891 from akeneo/PIM-3368

PIM-3368: Fix association transformer
PIM-3377: Check the locale specific during imports and exports
Merge pull request #1844 from akeneo/PIM-3377

PIM-3377: Check if locale specific exists in attribute dunring import
PIM-3448: add a method to retrieve attribute groups from a list of attribute codes
Merge pull request #1897 from akeneo/PIM-3448

PIM-3448: add a method to retrieve attribute groups from a list of attri...
PIM-3377: Fix cs for static analysis
Merge pull request #1901 from akeneo/PIM-3377

PIM-3377: Fix cs for static analysis
PIM-3458 Automatically set next sort order when creating an attribute group