Fix not setting status if show location is missing but sickbeard.ADD_SHOWS_WO_DIR is set
Change setting status to UNAIRED for future episodes (GC-2397)

Only set status to UNAIRED if current status is SKIPPED, UNAIRED, UNKNOWN or WANTED,
should prevent re-downloading of early releases that are already downloaded and deleted (status IGNORED) or archived
Merge branch 'fix_change_setting_episode_status' into test-20140526

* fix_change_setting_episode_status:
  Change setting status to UNAIRED for future episodes (GC-2397)
  Fix not setting status if show location is missing but sickbeard.ADD_SHOWS_WO_DIR is set