minor change of TreasureDataLogger class
changed the behavior of HttpSender#emit(..); if record (map object) has 'time' key, HttpSender uses the record directly. if not have 'time' key, HttpSender puts 'time' data to the record. value of the 'time' key is created with System#currentTimeMillis()
Merge branch 'master' of github.com:treasure-data/td-logger-java