Fix some errors due to newer version of babel. Make sure webpack exits with...

Fix some errors due to newer version of babel. Make sure webpack exits with non-zero exit code if build fails ಠ_ಠ. [ci all]

bin/build

@@ -21,12 +21,12 @@ npm-install() {
 
 frontend() {
     echo "Running 'webpack -p' to assemble and minify frontend assets..." &&
-    ./node_modules/.bin/webpack -p
+    ./node_modules/.bin/webpack -p --bail
 }
 
 frontend-fast() {
     echo "Running 'webpack' to assemble and minify frontend assets..." &&
-    ./node_modules/.bin/webpack --devtool eval
+    ./node_modules/.bin/webpack --devtool eval --bail
 }
 
 sample-dataset() {

frontend/src/metabase/dashboard/components/RefreshWidget.jsx

@@ -59,5 +59,3 @@ const RefreshOption = ({ name, period, selected, onClick }) =>
         <span className={styles.name}>{ name.split(" ")[0] }</span>
         <span className={styles.nameSuffix}> { name.split(" ")[1] }</span>
     </li>
-
-export default RefreshWidget;

frontend/src/metabase/visualizations/components/settings/ChartSettingInputNumeric.jsx

@@ -39,5 +39,3 @@ export default class ChartSettingInputNumeric extends Component {
         );
     }
 }
-
-export default ChartSettingInputNumeric;

package.json

@@ -132,7 +132,7 @@
     "test-watch": "karma start frontend/test/karma.conf.js --auto-watch --reporters nyan",
     "test-e2e": "JASMINE_CONFIG_PATH=./frontend/test/e2e/support/jasmine.json jasmine",
     "test-e2e-sauce": "USE_SAUCE=true npm run test-e2e",
-    "build": "webpack",
+    "build": "webpack --bail",
     "build-watch": "webpack --watch",
     "build-hot": "NODE_ENV=hot webpack && NODE_ENV=hot webpack-dev-server",
     "shrinkwrap": "npm prune && npm shrinkwrap --dev && ./bin/clean-shrinkwrap",