Added Show.airedOn() to look up episodes by date.
Added Show.airedOn() to look up episodes by date.

Collisionc/sickbeard_mp4_automator,dpimenov/tvdb_api,Collisionc/sickbeard_mp4_automator,dbr/tvdb_api,phtagn/sickbeard_mp4_automator,dpimenov/tvdb_api,Filechaser/sickbeard_mp4_automator,Filechaser/sickbeard_mp4_automator,phtagn/sickbeard_mp4_automator