Add Title element for teleplays.

Title is a commonly used type element for teleplays. Mostly, it used for the title of the series or episode... or even the title of the act break.

[An example](http://www.malcolminthemiddle.co.uk/gallery/data/1147/medium/The_Wonder_Years_original_pilot_script_2_MITMVC.jpg) of most common use of Title in screenplays.