fixed: divided NicoVideoDownTaskProcessor's TaskCounter to TaskProcessCounter.scala
fixed: NicoVideoDownTaskProcessor's assertion, errorMsg, to more sophisticated.
fixed: impled (facade's)VideoEntryDownloadReceiver.watchId prop,
and fixed param name watchId to watchIdOrNull(to sophisticate).
gitignore-fixed: tempoo, tempoo/* ignore changed to /tempoo (using root dir)
gitignore-fixed: workspace/* changed to /workspace (using root dir sign).