Merge pull request #26 from sveltejs/gh-14

inject HMR import

lib/utils/create_app.js

@@ -22,11 +22,16 @@ module.exports = function create_app() {
 				.join(', ')
 		}]`;
 
-		const main = template
+		let main = template
 			.replace(/__app__/g, path.resolve(__dirname, '../../runtime/app.js'))
 			.replace(/__routes__/g, code)
 			.replace(/__dev__/g, String(dev));
 
+		if (dev) {
+			const hmr_client = require.resolve(`webpack-hot-middleware/client`);
+			main += `\n\nimport('${hmr_client}?path=/__webpack_hmr&timeout=20000'); if (module.hot) module.hot.accept();`
+		}
+
 		const file = path.resolve(dest, 'main.js');
 
 		fs.writeFileSync(file, main);