also update transport imports

Author: evanmcc

riak/tests/test_kv.py

@@ -2,7 +2,10 @@
 import os
 import cPickle
 import copy
-import json
+try:
+    import simplejson as json
+except ImportError:
+    import json
 
 
 class NotJsonSerializable(object):

riak/transports/http/transport.py

@@ -19,7 +19,11 @@
 under the License.
 """
 
-import json
+try:
+    import simplejson as json
+except ImportError:
+    import json
+
 import urllib
 import re
 import csv