multi-purpose function

update travis to node 6, use node_modules travis says it cannot find modules(eslint, karma)

ditto

package.json

@@ -5,14 +5,14 @@
   "repository": "https://github.com/quran/quran.com-frontend",
   "scripts": {
     "test": "npm run test:dev:unit",
-    "test:ci:unit": "karma start --browsers PhantomJS --single-run; npm run test:ci:lint",
+    "test:ci:unit": "node_modules/.bin/karma start --browsers PhantomJS --single-run; npm run test:ci:lint",
     "test:ci:functional": "BROWSER=phantomjs bash tests/functional/test.sh start-ci",
     "posttest:ci:functional": "bash tests/functional/test.sh stop",
-    "test:dev:unit": "./node_modules/karma/bin/karma start",
-    "test:ci:lint": "eslint ./src/**/*.js",
+    "test:dev:unit": "./node_modules/.bin/karma start",
+    "test:ci:lint": "node_modules/eslint ./src/**/*.js",
     "test:dev:functional": "BROWSER=chrome bash tests/functional/test.sh start",
     "posttest:dev:functional": "bash tests/functional/test.sh stop",
-    "test:dev:lint": "node_modules/eslint/bin/eslint.js ./src/scripts/**/*.js",
+    "test:dev:lint": "./node_modules/.bin/eslint ./src/scripts/**/*.js",
     "test:stylelint": "node_modules/stylelint/dist/cli.js './src/**/*.scss' --config webpack/.stylelintrc",
     "dev": "env NODE_PATH='./src' PORT=8000 UV_THREADPOOL_SIZE=100 node webpack/webpack-dev-server.js & env NODE_PATH='./src' PORT=8000 node ./bin/server.js",
     "start": "NODE_PATH=\"./src\" node ./start",