[NGRINDER-489] fix default template to expose followRedirects and
timetout.
change default url from sample.com to please_modify_this.com
[NGRINDER-479] Make the heartbeat faster to 300ms
[NGRINDER-490] Make the external page opened in separate window
[NGRINDER-488] Add the check on the no test run
[NGRINDER-491] Make the minimum Xmx 100M.