update GETTING_STARTED file to match with angular2 v2.0.0-rc.5

[prabashbala]

Removed section is not applicable with angular v2 2.0.0-rc.5 anymore.

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[prabashbala]

I signed it

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CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[jelbourn]

Getting started has been updated to latest angular and cli versions.

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