RFR(S): 8145305: fix Nashorn shebang handling on Cygwin

[Michael Haupt]

Dear all,

please review this fix.
Bug: https://bugs.openjdk.java.net/browse/JDK-8145305
Webrev: http://cr.openjdk.java.net/~mhaupt/8145305/webrev.00/

It adapts the test for shebang handling so that it passes on Cygwin. Some documentation extension for NativeArray is piggybacked on the change.

Thanks,

Michael

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