RFR 8068978: All versions of javax.script.ScriptEngine.eval(...) method may clarify ScriptException throwing

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8068978/webrev.00/ for 
https://bugs.openjdk.java.net/browse/JDK-8068978

Thanks,
-Sundar