RFR 8087292: nashorn should have a "fail-fast" option for scripting, analog to bash "set -e"

[Sundararajan Athijegannathan]

Please review http://cr.openjdk.java.net/~sundar/8087292/ for 
https://bugs.openjdk.java.net/browse/JDK-8087292

Thanks,
-Sundar