[Developers] Updating ect of /tv/tv_program/theme_song

[Bryan Cheung]

https://bugs.freebase.com/browse/DA-580

In order to allow for reciprocation, the expected type of the "Theme  
song" property of "TV program" should be changed from Composition to a  
new type, "TV Theme Song" (/tv/tv_theme_song).  Queries that expect  
the expected type of /tv/tv_program/theme_song to be composition will  
break.  I'd like to make this change in a week or so - does anyone  
have queries that need to be modified that will need more time?

Thanks,
Bryan