[8u60] approval request for 8068978: All versions of javax.script.ScriptEngine.eval(...) method may clarify ScriptException throwing

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8068978
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-May/033685.html
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8068978/8u60/webrev.00/

Backported 'as is' except for modular source layout difference.

Thanks,
-Sundar