write to STDOUT will have timeout, to prevent hang in print
basic LSF support
upgrade EV to 4.18
	modified:   README.md
	modified:   STEP/CommonUtil.pm
	modified:   STEP/Helper.pm
	modified:   advanced_settings.pm
	modified:   default_farm.pm
	modified:   demo_config.pm
	modified:   lib/site_perl/5.14.2/x86_64-linux/EV.pm
	modified:   lib/site_perl/5.14.2/x86_64-linux/EV/ev.h
	modified:   lib/site_perl/5.14.2/x86_64-linux/EV/libev.pod
	modified:   lib/site_perl/5.14.2/x86_64-linux/auto/EV/EV.so
	modified:   nwtn.pm
	modified:   slave.pl
	modified:   step