fallback to Python 2.6 provided json module if simplejson is not available (cherry picked from commit e701953c4034f0314fbdfaa09af163682c966f82)
fallback to Python 2.6 provided json module if simplejson is not available
(cherry picked from commit e701953c4034f0314fbdfaa09af163682c966f82)

saebyn/chargify-python