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Hugo Agbonon bc634ea350 More helpful error message when react-native start is forgotten

Summary:
Developing with react-native on Linux, I found myself facing this message:

![chpao3jwuaehr_p jpg large](https://cloud.githubusercontent.com/assets/1598317/15032665/ae90ee88-1263-11e6-9acd-3fe261c08c28.jpeg)

The problem is actually quite simple: I hadn't used `react-native start` before starting `react-native run-android`, which caused this error, both on an emulator and a real Android device. As the message is currently unhelpful, but can be shown because of a simple mistake, I updated it.

~~Additionally, I clarified the fact that `react-native start` is still necessary on Linux, updating a title on the Linux and Windows Support documentation page.~~
Closes https://github.com/facebook/react-native/pull/7396

Differential Revision: D3305078

fbshipit-source-id: 2d87e02ff2ad15d8239fbcc0ada4a4e67b982e94

2016-05-20 09:13:27 -07:00