Add webpack2 support by changing the use of OccurenceOrderPlugin.

[arunoda]

Fixes: #396, #248

Stil storybook comes with Webpack 1. But it's possible to use webpack2 if your project use Webpack2.

Here we simply try to use the OccurenceOrderPlugin in both Webpack2 and Webpack1 in the way they exists.

[kevinSuttle]

@arunoda How does this affect the current setup?

Right now, I've patched it locally as my top-level config is Webpack 2, and my Storyboard config consists of this line (notice the function call at the end):

module.exports = require('../webpack.config.js')();

[arunoda]

This is just not a big change. But we simply add compatibility for both Webpack2 and Webpack1.

Not exactly sure about what you asked. But it should work without any issues.

[nx-cloud]

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