Karma 0.12 on Windows is not compatible with test script

[giogit]

The karma installation described in the tutorial setup guide for Windows is not compatible with the unit test launch script.
In fact, running npm install -g karma will install karma version 0.12, wich lacks of karma.cmd and then, when you try to launch the following script, you obtain an error:
https://github.com/angular/angular-phonecat/blob/master/scripts/test.bat

[petebacondarwin]

This is fixed. We are now using npm test to run karma, which works on Windows and *nix