updated contents from Atlas repo

decorators/average_oo.py

@@ -0,0 +1,21 @@
+"""
+>>> avg = Averager()
+>>> avg(10)
+10.0
+>>> avg(11)
+10.5
+>>> avg(12)
+11.0
+
+"""
+
+
+class Averager():
+
+    def __init__(self):
+        self.series = []
+
+    def __call__(self, new_value):
+        self.series.append(new_value)
+        total = sum(self.series)
+        return total/len(self.series)