Héctor Ramos 7d3fbbdb68 Introduce navigators in the tutorial
Summary:
Adds a new section to the tutorial. Covers the basics of scenes and navigators.

The navigator comparison doc has been moved to docs/navigation.html in this PR.

![navigators](https://cloud.githubusercontent.com/assets/165856/16505919/37459e3a-3ed4-11e6-87e9-5fa7e6f792d3.png)
Closes https://github.com/facebook/react-native/pull/8515

Differential Revision: D3507325

Pulled By: caabernathy

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