Summary:
The new Handling Touches guide provides an overall view of how touches can be handled. It is meant to be a higher level discussion of basic touch handling, e.g. "how do I implement a button?". The existing Gesture Responder System guide has been moved to the end of the docs and is still available for reference when building custom gesture handlers.
Reference: #8160
![handlingtouchesguide](https://cloud.githubusercontent.com/assets/165856/16256634/50a20c92-3808-11e6-8a5b-b49f2cda9fca.png)
Closes https://github.com/facebook/react-native/pull/8299
Differential Revision: D3469681
Pulled By: JoelMarcey
fbshipit-source-id: 3bc18e759b26c2d5c141b626acb433c5e973cef0