Dont use require('react/lib/*') in examples & docs

[zpao]

These are internal and implementation details of how React builds for npm. We're going to deprecate them. merge is now simply Object.assign and copyProperties is a simple for in (and can be replaced with Object.assign)

[justinwoo]

What's your position on this now, with the release of 0.12 with deprecation warnings for merge/copyProperties and the provision of Object.assign in react/lib? Is it okay for the examples to simply be updated to use react/lib/Object.assign instead, or will even that be very quickly moved out of React entirely?

[fisherwebdev]

My understanding is that FB is working on exposing Object.assign in a way that can be shared across projects, not just within React. But we're not there yet. So I am thinking about using Sindre's npm module for Object.assign until then.

[justinwoo]

Cool, I'll look into updating my PR sometime later. It'd also be nice if we could also get Invariant to be shared when things are being bundled up.

[justinwoo]

Done: #91