Deprecate the Nashorn JavaScript script engine and APIs, and the jjs tool, with the intent to remove them in a future release ([JEP 335](http://openjdk.java.net/jeps/335)).

The Nashorn JavaScript Engine implementation, the APIs and the `jjs` shell tool have been deprecated and might be removed in a future release. Code that uses classes and interfaces from `jdk.nashorn.api.scripting` and `jdk.nashorn.api.tree` packages will get a deprecation warning from `javac`.

The Nashorn engine (when used by `javax.script` API or `jrunscript` tool) as well as `jjs` shell tool will print a warning message about deprecation. To disable this runtime warning message, users can include the new Nashorn option, `--no-deprecation-warning`. This might be useful for compatibility scripts that depend on exact output (such as, to avoid the warning breaking their expected exact output).