Support full component lifecycle in shallow rendering

[glenjamin]

Extracted as a separate issue from #4056 (comment)

I've put together a side-by-side comparison of lifecycle support between "normal" rendering and "shallow" rendering.

http://jsfiddle.net/xvs6xdfk/3/

Output using normal rendering

Rendering Comp with Object {key: 1, a: 1}
componentWillMount []
render []
componentDidMount []
Rendering Comp with Object {key: 1, a: 2}
componentWillReceiveProps [Object, Object]
shouldComponentUpdate [Object, null, Object]
componentWillUpdate [Object, null, Object]
render []
componentDidUpdate [Object, null, Object]
Rendering Comp with Object {key: 2}
componentWillUnmount []
componentWillMount []
render []
componentDidMount []

Output using shallow rendering

Rendering Comp with Object {key: 1, a: 1}
componentWillMount []
render []
Rendering Comp with Object {key: 1, a: 2}
componentWillReceiveProps [Object, Object]
shouldComponentUpdate [Object, null, Object]
componentWillUpdate [Object, null, Object]
render []
Rendering Comp with Object {key: 2}
componentWillReceiveProps [Object, Object]
shouldComponentUpdate [Object, null, Object]
componentWillUpdate [Object, null, Object]
render []

Happy to look into doing a PR for this, although I'm not sure quite where to start - would this be done in the shallow renderer itself, or pushed down to a custom transaction as mentioned in #4019 (comment) ?

[gaearon]

Somewhat related: #3760