feat(package): add test:client script

Author: Awk34

Diff for: templates/app/_package.json

@@ -214,6 +214,7 @@
   },
   "scripts": {
     "test": "gulp test",
+    "test:client": "karma start ./karma.conf.js --single-run",
     <%_ if(filters.flow) { -%>
     "flow": "flow",
     <%_ } -%>

Diff for: templates/app/karma.conf.js

@@ -2,7 +2,7 @@
 // http://karma-runner.github.io/0.13/config/configuration-file.html
 /*eslint-env node*/
 
-import makeWebpackConfig from './webpack.make';
+const makeWebpackConfig = require('./webpack.make');
 
 module.exports = function(config) {
   config.set({