add automatic es5-shim loader

Author: robwise

client/webpack.client.rails.config.js

@@ -24,7 +24,8 @@ config.entry.app.push('./app/startup/clientGlobals');
 // See webpack.common.config for adding modules common to both the webpack dev server and rails
 
 config.module.loaders.push(
-  {test: /\.jsx?$/, loader: 'babel-loader', exclude: /node_modules/}
+  {test: /\.jsx?$/, loader: 'babel-loader', exclude: /node_modules/},
+  {test: require.resolve("react"), loader: "imports?shim=es5-shim/es5-shim&sham=es5-shim/es5-sham"}
 );
 
 module.exports = config;