fix the disappearing footer on the todomvc-flux sample
another way to fix the footer that is not shown
Update AUTHORS for 0.11 [ci skip]
Update polyfills list in docs [skip ci]

Fixes #1744
Update supported elements and properties [skip ci]
Merge pull request #1796 from enguerran/footer

fix the disappearing footer on the todomvc-flux sample
tutorial: Fetch data in componentDidMount instead

In a world where this component was server-rendered, we wouldn't want to call the data-fetching code there so it makes more sense to have it in componentDidMount.
Docs: added note about `renderComponent()` requirement