Update karma sauce config

Author: kamilogorek

CONTRIBUTING.md

@@ -54,11 +54,15 @@ From the command line (run all required checks):
 $ npm run test
 ```
 
-From your browser (run unit and integration tests separately):
+From your browser (run unit tests):
 
 ```bash
 $ npm run test:karma:unit
-// or
+```
+
+or (run integration tests):
+
+```bash
 $ npm run test:karma:integration
 ```
 

karma.sauce.config.js

@@ -102,6 +102,9 @@ module.exports = function(config) {
     browserNoActivityTimeout: 600000,
     captureTimeout: 600000,
     sauceLabs: {
+      startConnect: false,
+      // Just something "random" so we don't have to provide additional ENV var when running locally
+      tunnelIdentifier: process.env.TRAVIS_JOB_NUMBER || Math.ceil(Math.random() * 1337),
       recordScreenshots: false,
       recordVideo: false,
       testName: