Added: Show.AddNew

This function adds a show to sickbeard with the provided tvdb id and show name with the optional parameters, inheriting sickbeard's defaults (location / status / rootdir / quality).
REM: Ideally I would like to make the show_name optional rather than required as I think we should just use the tvdb show name rather than ask for it.
API-Builder: Added a 7th select for AddNew's option. I still left out language.. debating if it's worth adding an 8th just to show it. May combine it with another option like we do for History..