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.
yup. we were on 1.2.3 and this had our Windows developers scratching their heads since they got used to the =n behaivors back in the Play days(we jumped from 2.2 to 2.3). We grabed the 1.2.7 and problem solved.