PIM-3561 : add a product template repository
PIM-3561 : add the support for many prices in a single field
PIM-3561 : add the support of metric data from a single field
PIM-3561 : fix the media denormalizer to allow to import media for
variant group values, will require some EE refactoring
PIM-3561 : clean create product template command
Merge pull request #1946 from akeneo/PIM-3561-multi-prices

PIM 3561 : variant group, add support for multi prices in one field and metric in one field