Inline spree_last_address into the codebase to attempt to fix errors with it appearing only in prod

Gemfile

@@ -8,7 +8,6 @@ gem 'spree', :github => 'eaterprises/spree', :branch => '1-3-stable'
 gem 'spree_i18n', :github => 'spree/spree_i18n'
 gem 'spree_auth_devise', :github => 'spree/spree_auth_devise', :branch => '1-3-stable'
 gem 'spree_paypal_express', :github => 'spree/spree_paypal_express', :branch => '1-3-stable'
-gem 'spree_last_address', :github => 'eaterprises/spree_last_address'
 
 gem 'comfortable_mexican_sofa'
 

Gemfile.lock

@@ -56,13 +56,6 @@ GIT
     spree_sample (1.3.3)
       spree_core (= 1.3.3)
 
-GIT
-  remote: git://github.com/eaterprises/spree_last_address.git
-  revision: ab1b66cc7930405e5cc59ce9b71ea81b59d1c8ed
-  specs:
-    spree_last_address (1.0.0)
-      spree_core (~> 1.0)
-
 GIT
   remote: git://github.com/spree/deface.git
   revision: 1110a1336252109bce7f98f9182042e0bc2930ae
@@ -512,7 +505,6 @@ DEPENDENCIES
   spree!
   spree_auth_devise!
   spree_i18n!
-  spree_last_address!
   spree_paypal_express!
   therubyracer
   timecop

app/controllers/spree/checkout_controller_decorator.rb

@@ -1,5 +1,30 @@
 Spree::CheckoutController.class_eval do
+
+  private
+
   def before_payment
     current_order.payments.destroy_all if request.put?
   end
-end
+
+  # Adapted from spree_last_address gem: https://github.com/TylerRick/spree_last_address
+  # Originally, we used a forked version of this gem, but encountered strange errors where
+  # it worked in dev but only intermittently in staging/prod.
+  def before_address
+    associate_user
+
+    last_used_bill_address, last_used_ship_address = find_last_used_addresses(@order.email)
+    preferred_bill_address, preferred_ship_address = spree_current_user.bill_address, spree_current_user.ship_address if spree_current_user.respond_to?(:bill_address) && spree_current_user.respond_to?(:ship_address)
+    @order.bill_address ||= preferred_bill_address || last_used_bill_address || Spree::Address.default
+    @order.ship_address ||= preferred_ship_address || last_used_ship_address || Spree::Address.default
+  end
+
+  def find_last_used_addresses(email)
+    past = Spree::Order.order("id desc").where(:email => email).where("state != 'cart'").limit(8)
+    if order = past.detect(&:bill_address)
+      bill_address = order.bill_address.clone if order.bill_address
+      ship_address = order.ship_address.clone if order.ship_address
+    end
+
+    [bill_address, ship_address]
+  end
+end