rename namespace Statistics to Stats

--HG--
extra : convert_revision : 28f1703f8d7d8cf33fb952ae450f66bdba860fb7
diff --git a/base/stats/output.hh b/base/stats/output.hh
index 9f1fbf4..186d7ba 100644
--- a/base/stats/output.hh
+++ b/base/stats/output.hh
@@ -33,7 +33,7 @@
 
 #include "base/stats/visit.hh"
 
-namespace Statistics {
+namespace Stats {
 
 struct Output : public Visit
 {
@@ -42,6 +42,6 @@
     virtual bool valid() const = 0;
 };
 
-/* namespace Statistics */ }
+/* namespace Stats */ }
 
 #endif // __BASE_STATS_OUTPUT_HH__