CLI code refactor (#665)

* CLI refactor

* es6 rollback

* Travis fix

* syntax fix

* clustered require statements

* travis debug

* travis debug

src/Modules.js

@@ -31,4 +31,4 @@ module.exports = {
   'rotate': require('./modules/Rotate'),
   'saturation': require('./modules/Saturation'),
   'white-balance': require('./modules/WhiteBalance')
-}
+}