Create config module that contains webpack common configuration | Fixes

#1049

packages/clay-config/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "clay-config",
+  "version": "2.1.12",
+  "description": "Configuration files for Clay components",
+  "license": "BSD",
+  "main": "src/all/config.js",
+  "repository": "https://github.com/liferay/clay/tree/master/packages/clay-config",
+  "dependencies": {
+    "webpack": "^3.0.0"
+  }
+}

packages/clay-config/src/all/config.js

@@ -0,0 +1,5 @@
+const webpackCommonConfig = require('../webpack-common.config');
+
+module.exports = {
+	webpackCommonConfig
+}

packages/clay-config/src/webpack-common.config.js

@@ -0,0 +1,29 @@
+const webpack = require('webpack');
+
+module.exports = {
+	module: {
+		rules: [
+			{
+				test: /\.js$/,
+				exclude: /(node_modules|bower_components)/,
+				use: {
+					loader: 'babel-loader',
+					options: {
+						compact: false,
+						presets: ['babel-preset-env'],
+						plugins: ['babel-plugin-transform-node-env-inline'],
+					},
+				},
+			},
+		],
+	},
+	devtool: 'cheap-module-source-map',
+	output: {
+		library: 'metal',
+		libraryTarget: 'this',
+	},
+	plugins: [new webpack.optimize.ModuleConcatenationPlugin()],
+	resolve: {
+		mainFields: ['esnext:main', 'main'],
+	},
+};