8156101: JShell SPI: Provide a pluggable execution control SPI
Reviewed-by: jlahoda

8154485: JShell: infrastructure for multi-Snippet class wrappers
Reviewed-by: jlahoda

8080357: JShell: Only unqualified unresolved references should be corralled
8081431: JShell: Dropping import should update dependencies
Reviewed-by: jlahoda

8146368: JShell: couldn't smash the error when it's Japanese locale
Reviewed-by: rfield
Contributed-by: bitterfoxc@gmail.com

8145342: Some copyright notices are inconsistently and ill formatted
Summary: Adjusted formatting of copyright notices.
Reviewed-by: darcy, alundblad

8134254: JShell API/tool: REPL for Java into JDK9
Summary: Adding the implementation of the jshell (read-eval-print-loop) tool.
Reviewed-by: briangoetz, mcimadamore, psandoz, forax
Contributed-by: robert.field@oracle.com, bitterfoxc@gmail.com, jan.lahoda@oracle.com