PIM-2187 : update the MongoDB price normalizer to ease filtering
PIM-2187 : add a price filter and its spec for MongoDB
PIM-2187 : update the product query builder to use the price filter
PIM-2187 : fix the date attribute value hydrator for Mongo (a product
can have an empty date value)
PIM-2187 : update price normalizer (MongoDB)
PIM-2187 : fix CS
Merge pull request #889 from akeneo/mongo/price-filter

Add price filter (MongoDB support)