Fix warning when building on Windows.

Use `chmod` from shell.js.
Merge pull request #1147 from XhmikosR/master

chmod
Fixed 1152: Replace get/set with normal functions (for jsbin)
Version 2.1.4
Fixed #1109: Parse yield expressions.

Also fixed #387.
Also fixed #1108.
Fixed #704: Add config file support for the Rhino wrappers.

Closed #1130.
Fixed #1133: Make shelljs imply node.
Fixed #1138: Count ternary and or operators for complexity
Fixed #1134: Catch reserved words in ES3 mode.

Closed #1139.
Fixed #1154: Add MouseEvent and CustomEvent browser globals
ril: workaround for fall through
ril: disable let redefine
ril: add custom config and jshint-gecko wrapper
add readme and install script
add image