Fixes issue #85. Also moves all json imports to go through oauth2client.anyjson.  Reviewed in http://codereview.appspot.com/5531064/.
diff --git a/oauth2client/anyjson.py b/oauth2client/anyjson.py
new file mode 100644
index 0000000..ae21c33
--- /dev/null
+++ b/oauth2client/anyjson.py
@@ -0,0 +1,32 @@
+# Copyright (C) 2010 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Utility module to import a JSON module
+
+Hides all the messy details of exactly where
+we get a simplejson module from.
+"""
+
+__author__ = 'jcgregorio@google.com (Joe Gregorio)'
+
+
+try: # pragma: no cover
+  # Should work for Python2.6 and higher.
+  import json as simplejson
+except ImportError: # pragma: no cover
+  try:
+    import simplejson
+  except ImportError:
+    # Try to import from django, should work on App Engine
+    from django.utils import simplejson
diff --git a/oauth2client/appengine.py b/oauth2client/appengine.py
index 723de8a..e4169e9 100644
--- a/oauth2client/appengine.py
+++ b/oauth2client/appengine.py
@@ -25,18 +25,9 @@
 import pickle
 import time
 
-try: # pragma: no cover
-  import simplejson
-except ImportError: # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
-
 import clientsecrets
 
+from anyjson import simplejson
 from client import AccessTokenRefreshError
 from client import AssertionCredentials
 from client import Credentials
diff --git a/oauth2client/client.py b/oauth2client/client.py
index 07df411..46d6cff 100644
--- a/oauth2client/client.py
+++ b/oauth2client/client.py
@@ -31,6 +31,7 @@
 import urllib
 import urlparse
 
+from anyjson import simplejson
 
 HAS_OPENSSL = False
 try:
@@ -41,16 +42,6 @@
 except ImportError:
   pass
 
-try:  # pragma: no cover
-  import simplejson
-except ImportError:  # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
-
 try:
   from urlparse import parse_qsl
 except ImportError:
diff --git a/oauth2client/clientsecrets.py b/oauth2client/clientsecrets.py
index da48be7..1327a2a 100644
--- a/oauth2client/clientsecrets.py
+++ b/oauth2client/clientsecrets.py
@@ -21,15 +21,7 @@
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 
-try: # pragma: no cover
-  import simplejson
-except ImportError: # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
+from anyjson import simplejson
 
 # Properties that make a client_secrets.json file valid.
 TYPE_WEB = 'web'
diff --git a/oauth2client/crypt.py b/oauth2client/crypt.py
index 323345a..3df861d 100644
--- a/oauth2client/crypt.py
+++ b/oauth2client/crypt.py
@@ -21,16 +21,7 @@
 import time
 
 from OpenSSL import crypto
-
-try:  # pragma: no cover
-  import simplejson
-except ImportError:  # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
+from anyjson import simplejson
 
 
 CLOCK_SKEW_SECS = 300  # 5 minutes in seconds
diff --git a/oauth2client/file.py b/oauth2client/file.py
index 34a5f48..d20cf6e 100644
--- a/oauth2client/file.py
+++ b/oauth2client/file.py
@@ -22,18 +22,7 @@
 
 import threading
 
-
-try:  # pragma: no cover
-  import simplejson
-except ImportError:  # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
-
-
+from anyjson import simplejson
 from client import Storage as BaseStorage
 from client import Credentials
 
diff --git a/oauth2client/multistore_file.py b/oauth2client/multistore_file.py
index cf43dd9..b6126f5 100644
--- a/oauth2client/multistore_file.py
+++ b/oauth2client/multistore_file.py
@@ -37,16 +37,7 @@
 import os
 import threading
 
-try:  # pragma: no cover
-  import simplejson
-except ImportError:  # pragma: no cover
-  try:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
-  except ImportError:
-    # Should work for Python2.6 and higher.
-    import json as simplejson
-
+from anyjson import simplejson
 from client import Storage as BaseStorage
 from client import Credentials