Support new labelRenderer and valueRenderer properties

[bvaughn]

In order to support bvaughn/redux-devtools-filterable-log-monitor/issues/8, I need finer-grained control over what is rendered for node keys and values. So I set out to add 2 new properties: labelRenderer and valueRenderer.

Along the way I also noticed a lot of repetition between classes (JSONBooleanNode, JSONDateNode, JSONFunctionNode, JSONNullNode, JSONNumberNode, and JSONUndefinedNode- and even JSONArrayNode, JSONIterableNode, and JSONObjectNode). So I did some refactoring to tidy things up a bit. I hope I didn't take too much liberty by doing this.

I'd love to see this feature merged and I'd be willing to make any changes you feel necessary. Please feel free to reach out to me and we can chat. :)

[bvaughn]

Temporarily closing this PR while I investigate a performance issue. Will re-open once I've identified it.

[chibicode]

@bvaughn thanks a lot! Keep me updated.

[bvaughn]

Happy to help. Will do! I noticed a performance decrease in the branch of bvaughn/redux-devtools-filterable-log-monitor that integrated with this update and I just wanted to rule out the change here before submitting. I'll keep you posted. :)

[bvaughn]

I identified the performance issue. My branch accidentally introduced a regression- all nodes were expanded by default instead of just the root. Easy enough to fix. :)

[chibicode]

Should be <strong>{ raw }</strong> (same for em) instead

[bvaughn]

Whoops! Nice catch. I need to pay more attention to my code examples. :)

[chibicode]

Added one comment but this looks good. Thank you so much for cleaning it up! (and say hi to Treasure Data folks)

I tried to run npm start under examples directory and it failed. The error was Can't add property context, object is not extensible. I'm guessing it's because this PR is dependent on one of React 0.14's features, and react-json-tree's examples is using React 0.13. Do you think that's the case?

I'm fine w/ dropping the support for 0.13. Just let me know if I should.

I'd also add this to examples/src/App.js:

<h3>More Fine Grained Rendering</h3>
<p>Pass <code>labelRenderer</code> or <code>valueRenderer</code>.</p>
<div>
  <JSONTree data={ data }
            labelRenderer={raw => <strong>{ raw }</strong>}
            valueRenderer={raw => <em>{ raw }</em>} />
</div>

[bvaughn]

Not a problem! Thanks for the useful library. :)

Hm. I'm unsure about the issue you pointed out. I don't specifically remember using any React 0.14.x features. That being said, updating the example package to React 0.14.x did resolve the problem- so if you don't mind me bumping that dependency with this PR- that would certainly be the most straight forward solution.

I updated the example App with the blurb you suggested. Thanks for that.

[chibicode]

@bvaughn sounds good, thank you!

[bvaughn]

You're quite welcome! :)

[chibicode]

@bvaughn published 0.4.0.

[bvaughn]

Thanks so much for the speedy update!