The code in the method Launcher.isUnix uses the jvm function return
File.pathSeparatorChar==':'; to determine if this Launcher is a unix or a
windows one. However this is executed on the master ONLY. Thus if the master and
slave are of different OS types (Linux master and Windows Slave or vice versa)
then this function will return the incorrect answer. Makes having a single
master manage both windows and linux/unix slave impossible.