Fixes issue #85. Also moves all json imports to go through oauth2client.anyjson.  Reviewed in http://codereview.appspot.com/5531064/.
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