fix the disappearing footer on the todomvc-flux sample
another way to fix the footer that is not shown
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.
Fix react-dislayName-test

[skip ci]
Add String.prototype.trim to polyfill check

Also shortens the URL so it fits on 1 line
Update AUTHORS
Update acknowledgements page from AUTHORS