Upgrade bucklets to latest revision

* Add COPYING file with Apache 2.0 license
  Fix Eclipse project generation

Change-Id: I88ce867d89a4524b11c85655b8d83fe4331df4df

bucklets

diff --git a/bucklets b/bucklets
index c2f7d8d..2c70917 160000
--- a/bucklets
+++ b/bucklets
@@ -1 +1 @@
-Subproject commit c2f7d8dc0388276c9db63a894af78bc480312c99
+Subproject commit 2c70917d6b6e903b5086168f3bc84cbc195c36ae