Offer The appCache Nanny as a caching strategy option during project generation

[cmelion]

The current strategy is to use cache busting configured in webpack config:

   config.output = isTestEnv ? {} : {
       path: root('dist'),
       publicPath: '',
       filename: ENV === 'build' ? 'js/[name].[hash].js' : 'js/[name].js',
       chunkFilename: ENV === 'build' ? '[id].[hash].chunk.js' : '[id].chunk.js',
   };

AppCache is more efficient and adds offline capabilities, appCache Nanny adds workarounds for the less desirable caching behaviors appCache exhibits.

https://github.com/gr2m/appcache-nanny

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