[Stk] bug fix release (4.1.3)

[Gary Scavone]

Hi all,

I posted a new release yesterday that fixes an RtAudio bug with 
Windows DirectSound support for soundcards with output-only devices.  
If you don't use Windows, there is no need to update.

Over the past few days, I (with help from Ge Wang at Princeton) found
ways to significantly improve the response of STK example and demo
programs on OS-X systems.  I'm not done working out all the issues,
but it likely won't take too long.  Making a new release entails a
decent amount of work on my part, so I'd be interested to hear
suggestions on how I might make updated STK class files or programs
available between releases (in a way which is convenient for users).

Happy STKing!

--gary