Wait on promise in addition to callback

[jorrit]

The current implementation only supports rendering after loadProps invokes a callback. Wouldn't it be an interesting addition to also support loadProps returning a Promise and render after the promises resolve?

[ryanflorence]

Gonna keep it simple and stick with callbacks.

I'd be more interested in figuring out some API to let you plug in this kind of behavior.

[ryanflorence]

Like, maybe its just a prop like resolve here: https://github.com/rackt/async-props/blob/master/modules/AsyncProps.js#L184

[sars]

@jorrit @ryanflorence This should fix this problem #42