Revert "delete 'some?', change 'zip-contains-dir?'. make storm-core/src/clj/backtype/storm/util.clj compatible with clojure 1.6. in fact zip-contains-dir? use some? will include empty zip file."

This reverts commit e738e27ed8a24b30143c229a3b8405271372ca23.
use boolean to replace some?, backtype.storm.util is compatible with clojure 1.6