Incomplete documentation around FluxComponent

[chadly]

I spent a good hour trying to figure this out until I found #61. flux it is not available on the react context unless you explicitly include it in contextTypes:

contextTypes: {
    flux: React.PropTypes.any
}

this.context.flux is undefined in a react component until you add the contextType. Just adding a note to that effect to the docs would be enormously helpful to beginners.

[acdlite]

That's a good point. Docs assume some knowledge of context already, which isn't nice for beginners.

[burabure]

I explain context in my updated docs.#136 #169

[pburtchaell]

Yeah, I don't think it is good to assume knowledge of context since it is rather undocumented by the React team to begin with (which is reasonable considering it is "experimental"). 👍 to a PR to update the docs with that note.