Move zip package README.txt into a subdirectory because otherwise the

context is confusing.  People could easily look at it sitting in the
top of the git tree and think it's about the source distribution instead
of the zip file distribution.

Makefile

@@ -72,7 +72,7 @@ package:
 	cp -rp target/hadoop target/h2o-$(PROJECT_VERSION)
 	cp -p target/h2o.jar target/h2o-$(PROJECT_VERSION)
 	cp -p target/h2o-sources.jar target/h2o-$(PROJECT_VERSION)
-	cp -p README.txt target/h2o-$(PROJECT_VERSION)
+	cp -p packaging/README.txt target/h2o-$(PROJECT_VERSION)
 	cp -p LICENSE.txt target/h2o-$(PROJECT_VERSION)
 	(cd target; zip -r h2o-$(PROJECT_VERSION).zip h2o-$(PROJECT_VERSION))
 	rm -fr target/h2o-$(PROJECT_VERSION)