fix(webpack): Fix tests unable to run

Needed to enable module processing in babel again. This means webpack cannot use tree shaking at the moment.

karma.conf.js

@@ -134,10 +134,10 @@ module.exports = function(config) {
       module: Object.assign({}, webpackConfig.module, {
         // Cover source files when not debugging tests. Otherwise, omit coverage instrumenting to get
         // uncluttered source maps.
-        loaders: webpackConfig.module.loaders.concat([config.singleRun ? {
+        rules: webpackConfig.module.rules.concat([config.singleRun ? {
           test: /\.js$/,
           include: path.resolve('./packages'),
-          loader: 'isparta',
+          loader: 'isparta-loader',
         } : undefined]).filter(Boolean),
       }),
     }),

package.json

@@ -80,12 +80,7 @@
   },
   "babel": {
     "presets": [
-      [
-        "es2015",
-        {
-          "modules": false
-        }
-      ]
+        "es2015"
     ],
     "plugins": [
       "transform-object-assign"

webpack.config.js

@@ -66,7 +66,7 @@ module.exports = [{
   },
   devtool: IS_DEV ? 'source-map' : false,
   module: {
-    loaders: [{
+    rules: [{
       test: /\.js$/,
       exclude: /node_modules/,
       loader: 'babel-loader',
@@ -90,7 +90,7 @@ module.exports = [{
   },
   devtool: IS_DEV ? 'source-map' : false,
   module: {
-    loaders: [{
+    rules: [{
       test: /\.js$/,
       include: [path.resolve(__dirname, 'packages/material-components-web')],
       exclude: /node_modules/,