Update step_02.ngdoc

Request Type: docs

How to reproduce: In Windows attempt to run scripts\test.bat

Component(s): misc core

Impact: medium

Complexity: small

This issue is related to: 

**Detailed Description:**

In Windows you need the karma-cli with -g flag installed to let the bat script (scripts\test.bat) run.

**Other Comments:**

Line 189 does not install necessary dependencies in Windows
![image](https://f.cloud.github.com/assets/4668335/2507028/7f8a9146-b3b2-11e3-9252-62edfd7d3137.jpg)