Rename type for inventories and add mimetype for JSON API [SCI-2614][SCI-2616][SCI-2617]

app/serializers/api/v1/inventory_serializer.rb

@@ -3,6 +3,7 @@
 module Api
   module V1
     class InventorySerializer < ActiveModel::Serializer
+      type :inventories
       attributes :id, :name
     end
   end

config/initializers/mime_types.rb

@@ -2,3 +2,4 @@
 
 # Add new mime types for use in respond_to blocks:
 # Mime::Type.register "text/richtext", :rtf
+Mime::Type.register 'application/vnd.api+json', :json