Add backers and sponsors from Open Collective
Add backers and sponsors from Open Collective

This is for your open collective backers and sponsors to appear directly on your README. 
see how it'll look [here](https://github.com/apex/apex#backers)
[More info](https://github.com/opencollective/opencollective/wiki/Github-banner)

Also add badges on top.
skatejs/skatejs,skatejs/skatejs,chrisdarroch/skatejs,chrisdarroch/skatejs,skatejs/skatejs