Use markdown syntax to display images inline

Documentation updates

In order to use this native component the video resources must be
added to the project and bundled on build.

- Also remove a duplicate data property
- Fix linkrot in README and add Examples section

Update react-native requirement in example

react-native-video wants ^0.4.0, so let's give it to it.

This to avoid to send an errors stack caused by the `NaN` given in the JSON of the RCTEventDispatcher.

fixes #26