Linting in Webpack - Correcting loader

Hi,

I think 'eslint-loader' should be used instead `eslint`. The later will give the following error.


```
path/to/eslint/lib/api.js didn't return a function
 @ multi main
webpack: bundle is now VALID.
```

Someone talked about it as well in survivejs#3.

I'm new to eslint, so I hope this is correct.

manuscript/11_linting_in_webpack.md

@@ -194,7 +194,7 @@ var common = {
     preLoaders: [
       {
         test: /\.jsx?$/,
-        loaders: ['eslint'],
+        loaders: ['eslint-loader'],
         include: PATHS.app
       }
     ]