Add extract-text-webpack-plugin dependency

Author: jimitndiaye

package.json

@@ -66,6 +66,7 @@
     "exit": "^0.1.2",
     "exports-loader": "^0.6.3",
     "expose-loader": "^0.7.1",
+    "extract-text-webpack-plugin": "^2.0.0-beta.4",
     "file-loader": "^0.8.5",
     "fs-extra": "^0.30.0",
     "fs.realpath": "^1.0.0",

packages/angular-cli/package.json

@@ -49,6 +49,7 @@
     "exit": "^0.1.2",
     "exports-loader": "^0.6.3",
     "expose-loader": "^0.7.1",
+    "extract-text-webpack-plugin": "^2.0.0-beta.4",
     "file-loader": "^0.8.5",
     "fs-extra": "^0.30.0",
     "fs.realpath": "^1.0.0",