8134503: support ES6 parsing in Nashorn
Reviewed-by: jlaskey, sundar, mhaupt
Contributed-by: andreas.woess@oracle.com

8134941: Implement ES6 template literal support
Reviewed-by: attila, hannesw
Contributed-by: andreas.woess@oracle.com

8134873: Implement support for ES6 numeric literals
Reviewed-by: attila, sundar

8085885: address Javadoc warnings in Nashorn source code
Reviewed-by: hannesw, lagergren

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com