Ability to specify Post-Processing programs Folder for after downloads are completed

Hi.

I would like the ability in sonar to specify a post-processing programs folder for programs that can be called to perform actions after a episode is downloaded

For instance the ability to specify a installed video converter software such as handbrake or amerisoft video convertor ulitimate program to convert file type from .mkv format to .mp4 format after file is downloaded if the only available format for download is mkv type.

Already on Trello: https://trello.com/c/mCJyYeZl/122-custom-notifications-similar-to-sab-post-processing-scripts