Update index.ngdoc (karma-cli installation)

Request Type: docs

How to reproduce: 

Component(s): 

Impact: small

Complexity: small

This issue is related to: 

**Detailed Description:**

Added karma-cli installation (as proposed here http://stackoverflow.com/a/22329409/451962) which fixes karma's ability to run scripts\test.bat on windows.
Tested and working.

**Other Comments:**