Update README for Figaro config, add Maikel to credits
Stylistic changes
In BPE, rename producer and category JSON attrs to producer_id and category_id

Conflicts:

	spec/features/admin/bulk_product_update_spec.rb
Make spree_current_user available to serializers as 'scope'
WIP: Extract bulk product edit product management to BulkProducts service

Conflicts:

	app/assets/javascripts/admin/bulk_product_update.js.coffee
Extract DisplayProperties to a service

Conflicts:

	app/assets/javascripts/admin/bulk_product_update.js.coffee
WIP: Extracting BulkProducts-specific specs to their own file
WIP: More extracting BulkProducts-specific specs to their own file
Port fetch products specs to BulkProducts service specs
Port clone products specs to BulkProducts service specs
Port remaining specs to BulkProducts service specs