Upgrade to Webpack 4 - clean dependencies

Signed-off-by: David Mehren <dmehren1@gmail.com>

package.json

@@ -160,18 +160,14 @@
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.7.0",
-    "babel-preset-es2015": "^6.24.1",
-    "babel-preset-stage-2": "^6.24.1",
     "babel-runtime": "^6.26.0",
     "copy-webpack-plugin": "^4.5.2",
-    "css-loader": "^0.28.11",
+    "css-loader": "^1.0.0",
     "doctoc": "^1.3.0",
     "ejs-loader": "^0.3.1",
     "exports-loader": "^0.7.0",
     "expose-loader": "^0.7.5",
-    "extract-text-webpack-plugin": "^4.0.0-beta.0",
-    "file-loader": "^1.1.11",
-    "html-webpack-loader": "^0.0.5",
+    "file-loader": "^2.0.0",
     "html-webpack-plugin": "^4.0.0-alpha",
     "imports-loader": "^0.8.0",
     "jsonlint": "^1.6.2",