RFR 8133948: Add 'edit' function to allow external editing of scripts

[Sundararajan Athijegannathan]

Forgot to CC Jan ...

-Sundar

On 8/19/2015 10:01 PM, Sundararajan Athijegannathan wrote:
> Please review http://cr.openjdk.java.net/~sundar/8133948/ for 
> https://bugs.openjdk.java.net/browse/JDK-8133948
>
> Note: ExternalEditor and EditPad classes are from kulla/jshell code - 
> modified to suite nashorn jjs. Perhaps eventually code could be 
> refactored and reused from jdk.interanal.le.
>
> Thanks,
> -Sundar