Review request JDK-8006181 : nashorn script engine does not run jrunscript's initialization script

[A. Sundararajan]

Hi,

Please review http://cr.openjdk.java.net/~sundar/8006181/

This fix is by Andreas Rieber. The fix is to make sure nashorn script 
engine runs jrunscript's init script. Previously, nashorn script engine 
did not run jrunscript's init.js due to  various incompatibilities b/w 
Rhino and Nashorn implementations. But, with Andreas' fix nashorn script 
engine runs a replacement "init.js".

Please note that ideally we should fix JDK8's init.js copy. But, nashorn 
has not yet hit main jdk repo. Also, there is a chance that rhino *may* 
be removed for jdk8. So instead of waiting for all those, I am adapting 
Andreas' change for the interim. With the replacement init.js in 
nashorn.jar, nashorn will run jrunscript initialization script and we 
can run existing scripts that use jrunscript's init facilities. We can 
eventually modify jrunscript's init.js in future.

Please review.

Thanks
-Sundar