Add support for sources prop in Video component

[YomesInc]

Brief Summary of Changes

<Video> now supports the sources property:

<Video
  cloudName='demo'
  publicId='dog'
  sources={[
    {
      type: 'mp4',
      codecs: ['vp8', 'vorbis'],
      transformations: {
        videoCodec: 'auto'
      }
    },
    {
      type: 'webm',
      codecs: ['avc1.4D401E', 'mp4a.40.2'],
      transformations: {
        videoCodec: 'auto'
      }
    }
  ]}
/>

What does this PR address?

• New feature

Are tests included?

• Yes

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all of the tests pass.

[patrick-tolosa]

@maoznir Please note the build is failing, it looks like react is not a dependency of this project (it should probably be a devDependency).