fix(webpack.config.js): check into git

close #134

.gitignore

@@ -4,7 +4,6 @@
 **/dist
 **/lib
 **/src-gen
-**/webpack.config.js
 **/gen-webpack.config.js
 **/plugins
 **/tsconfig.tsbuildinfo

applications/electron/webpack.config.js

@@ -0,0 +1,17 @@
+/**
+ * This file can be edited to customize webpack configuration.
+ * To reset delete this file and rerun theia build again.
+ */
+// @ts-check
+const config = require('./gen-webpack.config.js');
+
+/**
+ * Expose bundled modules on window.theia.moduleName namespace, e.g.
+ * window['theia']['@theia/core/lib/common/uri'].
+ * Such syntax can be used by external code, for instance, for testing.
+config.module.rules.push({
+    test: /\.js$/,
+    loader: require.resolve('@theia/application-manager/lib/expose-loader')
+}); */
+
+module.exports = config;