Fixes: https://github.com/iojs/io.js/issues/992
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Brendan Ashworth <brendan.ashworth@me.com>
PR-URL: https://github.com/iojs/io.js/pull/1249
Inside the REPL, Control+D will exit. Multi-line expressions can be input.
Tab completion is supported for both global and local variables.
+Core modules will be loaded on-demand into the environment. For example,
+accessing `fs` will `require()` the `fs` module as `global.fs`.
+
The special variable `_` (underscore) contains the result of the last expression.
> [ "a", "b", "c" ]