Use python's json rather than Django's

django.utils.simplejson is deprecated; Python 2.6+ includes json.
Fixes #32.

djrill/mail/backends/djrill.py

@@ -2,7 +2,6 @@ from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.core.mail.backends.base import BaseEmailBackend
 from django.core.mail.message import sanitize_address, DEFAULT_ATTACHMENT_MIME_TYPE
-from django.utils import simplejson as json
 
 # Oops: this file has the same name as our app, and cannot be renamed.
 #from djrill import MANDRILL_API_URL, MandrillAPIError, NotSupportedByMandrillError
@@ -11,11 +10,13 @@ from ... import MANDRILL_API_URL, MandrillAPIError, NotSupportedByMandrillError
 from base64 import b64encode
 from email.mime.base import MIMEBase
 from email.utils import parseaddr
+import json
 import mimetypes
 import requests
 
 DjrillBackendHTTPError = MandrillAPIError # Backwards-compat Djrill<=0.2.0
 
+
 class DjrillBackend(BaseEmailBackend):
     """
     Mandrill API Email Backend

djrill/tests/mock_backend.py

@@ -1,8 +1,9 @@
+import json
 from mock import patch
 
 from django.conf import settings
 from django.test import TestCase
-from django.utils import simplejson as json
+
 
 class DjrillBackendMockAPITestCase(TestCase):
     """TestCase that uses Djrill EmailBackend with a mocked Mandrill API"""

djrill/views.py

@@ -1,8 +1,9 @@
+import json
+
 from django import forms
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import ImproperlyConfigured
-from django.utils import simplejson as json
 from django.views.generic import TemplateView
 
 from djrill import MANDRILL_API_URL