8174762: JShell: @since tags missing
Reviewed-by: jjg

8167128: JShell: /drop of statement gives confusing output
Reviewed-by: jlahoda

8139829: JShell API: No use of fields to return information from public types
Reviewed-by: vromero

8139837: JShell API: make a common JShellException
Reviewed-by: jlahoda

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