Upgrade factory_girl_rails to 4.8.0

This required changing some build_stubbed to create to fix

    stubbed models are not allowed to access the database

common_spree_dependencies.rb

@@ -23,7 +23,7 @@
   gem 'capybara-screenshot'
   gem 'database_cleaner', '~> 1.3'
   gem 'email_spec'
-  gem 'factory_girl_rails', '~> 4.5.0'
+  gem 'factory_girl_rails', '~> 4.8'
   gem 'launchy'
   gem 'rspec-activemodel-mocks', '~>1.0.2'
   gem 'rspec-collection_matchers'

core/spec/models/spree/order_spec.rb

@@ -1,9 +1,9 @@
 require 'spec_helper'
 
 describe Spree::Order, type: :model do
-  let(:store) { build_stubbed(:store) }
-  let(:user) { stub_model(Spree::LegacyUser, email: "spree@example.com") }
-  let(:order) { stub_model(Spree::Order, user: user, store: store) }
+  let(:store) { create(:store) }
+  let(:user) { create(:user, email: "spree@example.com") }
+  let(:order) { create(:order, user: user, store: store) }
 
   before do
     allow(Spree::LegacyUser).to receive_messages(current: mock_model(Spree::LegacyUser, id: 123))
@@ -680,6 +680,8 @@ def merge!(other_order, user = nil)
   end
 
   context "#generate_order_number" do
+    let(:order) { build(:order) }
+
     context "when no configure" do
       let(:default_length) { Spree::Order::ORDER_NUMBER_LENGTH + Spree::Order::ORDER_NUMBER_PREFIX.length }
       subject(:order_number) { order.generate_order_number }

core/spec/models/spree/tax/item_adjuster_spec.rb

@@ -50,7 +50,7 @@ def tax_adjustments
     end
 
     context 'when the order has a taxable address' do
-      let(:item) { build_stubbed :line_item, order: order }
+      let(:item) { create :line_item, order: order }
       let(:address) { order.tax_address }
 
       before do
@@ -65,8 +65,8 @@ def tax_adjustments
 
       context 'when there are matching rates for the zone' do
         context 'and all rates have the same tax category as the item' do
-          let(:item) { build_stubbed :line_item, order: order, tax_category: item_tax_category }
-          let(:item_tax_category) { build_stubbed(:tax_category) }
+          let(:item) { create :line_item, order: order, tax_category: item_tax_category }
+          let(:item_tax_category) { create(:tax_category) }
           let(:rate_1) { create :tax_rate, tax_category: item_tax_category }
           let(:rate_2) { create :tax_rate }
           let(:rates_for_order_zone) { [rate_1, rate_2] }