Fix package tagging.

Author: Martin Cox

Makefile

@@ -305,7 +305,7 @@ pkgclean: ballclean
 PKG_VERSION = $(shell echo $(PKG_ID) | sed -e 's/^$(REPO)-//')
 
 package:
-	git archive --format=tar HEAD | gzip >rel/pkg/out/riak-3.0.tar.gz
+	git archive --format=tar HEAD | gzip >rel/pkg/out/riak-$(PKG_ID).tar.gz
 	$(MAKE) -C rel/pkg/ -f Makefile
 
 packageclean: