Karma autoWatch is not working, I'm losing my mind over this.

### Expected behavior

when I change something in the test file, the tests are ran automatically
### Actual behavior

when I change something in the test file, the changes are not visible automatically. I have to open another cmd and execute "karma run" in order to run the tests again.
### Enviroment Details
- Karma version (output of `karma --version`): 0.13.22
- Relevant part of your `karma.config.js` file: everything is default
### Steps to reproduce the behaviour
1. npm install -g karma karma-cli karma-jasmine karma-chrome-launcher
2. karma init - leave everything default (location is "js/*.js")
3. karma start karma.conf.js
4. make a change in the test file --> nothing happens
5. restart karma in cmd, the changes are visible

A detailed report is also available here: http://stackoverflow.com/questions/36624752/karma-auto-watch-is-not-working

Reproduce the issue with the default karma.conf.js setup, the js/*.js file pattern, and the documented karma start and karma run commands. Verify that changing a test file while Karma is running automatically reruns the tests and that the updated results are visible without restarting the command.

Written by the indexing model from the issue text.