RFR 8068524: NashornScriptEngineFactory.getParameter() throws IAE for an unknown key, doesn't conform to the general spec

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8068524/ for 
https://bugs.openjdk.java.net/browse/JDK-8068524

PS. Piggybacking a sample that does javap-like disassembly but using 
openjdk asmtools.

Thanks,
-Sundar