angular-cli: Webpack v2.1.0-beta.23 breaks everything

In short, please pin the webpack version to v2.1.0-beta.22. beta 23 has breaking changes: https://github.com/webpack/webpack/releases/tag/v2.1.0-beta.23 PR follows soon!

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Please provide us with the following information:

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?) Windows
2. Versions. Please run ng --version. If there’s nothing outputted, please run in a Terminal: node --version and paste the result here: angular-cli: 1.0.0-beta.14
3. Repro steps. Was this an app that wasn’t created using the CLI? What change did you do on your code? etc. ng new foo-bar npm start
4. The log given by the failure. Normally this include a stack trace and some more information.

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration has an unknown property 'tslint'. These properties are valid:
   object { amd?, bail?, cache?, context?, devServer?, devtool?, entry, externals?, loader?, module?, name?, dependencies?, node?, output?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, stats?, target?, watch?, watchOptions? }
 - configuration.module has an unknown property 'preLoaders'. These properties are valid:
   object { rules?, loaders?, noParse?, unknownContextRequest?, unknownContextRegExp?, unknownContextRecursive?, unknownContextCritical?, exprContextRequest?, exprContextRegExp?, exprContextRecursive?, exprContextCritical?, wrappedContextRegExp?, wrappedContextRecursive?, wrappedContextCritical? }
   Options affecting the normal modules (`NormalModuleFactory`).
 - configuration.node.global should be a boolean.
 - configuration.resolve has an unknown property 'root'. These properties are valid:
   object { modules?, descriptionFiles?, plugins?, mainFields?, aliasFields?, mainFiles?, extensions?, enforceExtension?, moduleExtensions?, enforceModuleExtension?, alias?, symlinks?, unsafeCache?, cachePredicate?, fileSystem?, resolver? }
 - configuration.resolve.extensions[0] should not be empty.
WebpackOptionsValidationError: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration has an unknown property 'tslint'. These properties are valid:
   object { amd?, bail?, cache?, context?, devServer?, devtool?, entry, externals?, loader?, module?, name?, dependencies?, node?, output?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, stats?, target?, watch?, watchOptions? }
 - configuration.module has an unknown property 'preLoaders'. These properties are valid:
   object { rules?, loaders?, noParse?, unknownContextRequest?, unknownContextRegExp?, unknownContextRecursive?, unknownContextCritical?, exprContextRequest?, exprContextRegExp?, exprContextRecursive?, exprContextCritical?, wrappedContextRegExp?, wrappedContextRecursive?, wrappedContextCritical? }
   Options affecting the normal modules (`NormalModuleFactory`).
 - configuration.node.global should be a boolean.
 - configuration.resolve has an unknown property 'root'. These properties are valid:
   object { modules?, descriptionFiles?, plugins?, mainFields?, aliasFields?, mainFiles?, extensions?, enforceExtension?, moduleExtensions?, enforceModuleExtension?, alias?, symlinks?, unsafeCache?, cachePredicate?, fileSystem?, resolver? }
 - configuration.resolve.extensions[0] should not be empty.
    at webpack (E:\Angular2Buch\angular2-workshop-devmedia\node_modules\webpack\lib\webpack.js:16:9)
    at Class.run (E:\Angular2Buch\angular2-workshop-devmedia\node_modules\angular-cli\tasks\serve-webpack.js:23:27)
    at E:\Angular2Buch\angular2-workshop-devmedia\node_modules\angular-cli\commands\serve.js:84:26
    at process._tickCallback (internal/process/next_tick.js:103:7)