Big refactoring, way simpler management of transformations. Early branch for upcoming version 0.2.

tests/core/test_statistics.py

@@ -0,0 +1,14 @@
+from bonobo.core.statistics import WithStatistics
+
+
+class MyThingWithStats(WithStatistics):
+    def get_statistics(self, *args, **kwargs):
+        return (
+            ('foo', 42),
+            ('bar', 69),
+        )
+
+
+def test_with_statistics():
+    o = MyThingWithStats()
+    assert o.get_statistics_as_string() == 'foo=42 bar=69'