chore: add custom port configuration

Author: macedigital

README.md

@@ -27,6 +27,16 @@ npm run e2e
 npm test
 ```
 
+You can provide custom port-numbers via the environment variable `PORT`:
+
+```sh
+# run dev-server on port 1337
+PORT=1337 node run dev
+
+# run e2e tests on port 8888
+PORT=8888 node run e2e
+```
+
 For detailed explanation on how things work, checkout the [guide](http://vuejs-templates.github.io/webpack/) and [docs for vue-loader](http://vuejs.github.io/vue-loader).
 
 ## Demo

config/index.js

@@ -26,7 +26,7 @@ module.exports = {
   },
   dev: {
     env: devEnv,
-    port: 8080,
+    port: process.env.PORT || 8080,
     autoOpenBrowser: true,
     assetsSubDirectory: 'static',
     assetsPublicPath: '/',

package.json

@@ -15,10 +15,10 @@
   "scripts": {
     "prepush": "npm run eslint",
     "dev": "node build/dev-server.js",
-    "start": "node build/dev-server.js",
+    "start": "npm run dev",
     "build": "node build/build.js",
     "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
-    "e2e": "cross-env PORT=8082 node test/e2e/runner.js",
+    "e2e": "node test/e2e/runner.js",
     "test": "npm run unit && npm run e2e",
     "eslint": "eslint --ext .js,.vue build config src test/unit/specs test/e2e/specs"
   },