Add custom Knockout binding to render React components

[vaaralav]

About custom bindings: http://knockoutjs.com/documentation/custom-bindings.html

The API could be like this

<div data-bind:"react: {component: MyComponent, props: {todos: todos}}"></div>

Existing implementations

• https://github.com/adamtal3/knockout-react
• https://github.com/calvinwoo/knockout-bind-react