Fix Django 1.7 regressions when moving receivers

My fix in 5f23648 forgot to change the receiver registration in the app
config.
Also removed an unused import, and a deprecation warning in the tests.

oscar/apps/customer/config.py

@@ -8,5 +8,5 @@ class CustomerConfig(AppConfig):
     verbose_name = _('Customer')
 
     def ready(self):
-        from oscar.apps.customer import history  # noqa
+        from . import receivers  # noqa
         from .alerts import receivers  # noqa

oscar/apps/customer/history.py

@@ -2,7 +2,6 @@ import json
 
 from django.conf import settings
 from oscar.core.loading import get_model
-from django.dispatch import receiver
 
 from oscar.core.loading import get_class
 

tests/unit/core/prices_tests.py

@@ -33,7 +33,7 @@ class TestPriceObject(TestCase):
     def test_price_equals_currency_matters(self):
         price1 = Price(currency='EUR', excl_tax=D('10.00'), tax=D('2.00'))
         price2 = Price(currency='USD', excl_tax=D('10.00'), tax=D('2.00'))
-        self.assertNotEquals(price1, price2)
+        self.assertNotEqual(price1, price2)
         
     def test_price_equals_transitivity(self):
         prices = (

tox.ini

@@ -7,9 +7,6 @@
 exclude = migrations,south_migrations
 max-complexity = 10
 
-[tox]
-envlist = py27-1.6, py27-1.7, py33-1.6, py33-1.7, py34-1.6, py34-1.7
-
 [testenv]
 commands = python runtests.py []