Build and run errors, looks like the css files went missing in the assets folder. #227
Description
`ERROR in multi ./src/assets/pink-bluegrey.css
Module not found: Error: Can't resolve 'C:\opt\workspace\github\material.angular.io\src\assets\pink-bluegrey.css' in 'C:\opt\workspace\github\material.angular.io\node_modules@angular\cli\models\webpack-configs'
@ multi ./src/assets/pink-bluegrey.css
ERROR in multi ./src/assets/deeppurple-amber.css
Module not found: Error: Can't resolve 'C:\opt\workspace\github\material.angular.io\src\assets\deeppurple-amber.css' in 'C:\opt\workspace\github\material.angular.io\node_modules@angular\cli\models\webpack-configs'
@ multi ./src/assets/deeppurple-amber.css
ERROR in multi ./src/assets/indigo-pink.css
Module not found: Error: Can't resolve 'C:\opt\workspace\github\material.angular.io\src\assets\indigo-pink.css' in 'C:\opt\workspace\github\material.angular.io\node_modules@angular\cli\models\webpack-configs'
@ multi ./src/assets/indigo-pink.css
ERROR in multi ./src/assets/purple-green.css
Module not found: Error: Can't resolve 'C:\opt\workspace\github\material.angular.io\src\assets\purple-green.css' in 'C:\opt\workspace\github\material.angular.io\node_modules@angular\cli\models\webpack-configs'
@ multi ./src/assets/purple-green.css`