Pass webpack 2 build environment arguments, e.g. --env.production, in webpack dev middleware

Hi,

I've got the following `webpack.config.js` file in which I've added a guard clause to check that the build environment is properly injected (as it should be for webpack 2).

```js
module.exports = function (env) {
    if (env == null) {
        console.log("Environment is not set up. Webpack needs --env.dev or --env.prod arguments, passed to module.exports function(env)");
        throw new Error("Environment is not set up. Webpack needs --env.dev or --env.prod arguments, passed to module.exports function(env)");
    }
    if (env.prod) {
        return require('./config/webpack.prod.js');
    } else {
        return require('./config/webpack.dev.js');
    }
}
```

However, when I try to run the application with hot module replacement (i.e. in development), `env` is undefined.

The Code in `Startup.cs` looks like this:

```C#
if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();

               app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions { HotModuleReplacement = true });
            }
```

How can I fix this? (`process.argv.indexOf` is no longer supported in webpack 2)

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Pass webpack 2 build environment arguments, e.g. --env.production, in webpack dev middleware #816

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Uh oh!

Pass webpack 2 build environment arguments, e.g. --env.production, in webpack dev middleware #816

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