Added support for -jvm-debug option to activator.bat

I HAVE NOT TESTED THIS.

MERGE AT YOUR OWN RISK.

I don't have a Windows box handy to test it.
Is this a question about what it means or why it is set to ``suspend=y``?
I will try to answer both potential questions:
Setting ``suspend=y`` means that any execution will be deferred until a debugger is attached.
The reason it is set to ``y`` is probably because the same setting was used in Play.