added max and min to StatCounter repr for pyspark

Author: dwmclary

python/pyspark/statcounter.py

@@ -124,5 +124,5 @@ def sampleStdev(self):
         return math.sqrt(self.sampleVariance())
 
     def __repr__(self):
-        return "(count: %s, mean: %s, stdev: %s)" % (self.count(), self.mean(), self.stdev())
+        return "(count: %s, mean: %s, stdev: %s, max: %s, min: %s)" % (self.count(), self.mean(), self.stdev(), self.max(), self.min())