pull up Amon2::LocalContext to Amon2.pm.
It makes better interface.
(Operation class itself in 'import' function is wrong interface, i
think)
Checking in changes prior to tagging of version 3.72.

Changelog diff is:

diff --git a/Changes b/Changes
index 609e751..2283462 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,10 @@
+3.72 2013-02-13T08:51:52
+
+    - Added Amon2#make_local_context() method.
+      (tokuhirom)
+    - Removed EXPERIMENTAL Amon2::LocalContext class.
+      Introduced in 3.71.
+
 3.71 2013-02-12T18:04:33

     [EXPERIMENTAL FEATURE]