Extract JSONTree

[chibicode]

• Closes Split JSONTree into its own npm package? #85
• JSONTree has been extracted to chibicode/react-json-tree (npm).
• Tested by running examples/counter and examples/todomvc against it.
• src/utils/deepEqual.js and src/utils/hexToRgb.js were both only used by JSONTree, so I removed those as well.
• The original credits are moved to README.md and package.json.
• Don't mind transferring the ownership of chibicode/react-json-tree to @gaearon. Just let me know.

[chibicode]

Note: I realized that JSONTree actually doesn't work if theme prop is missing.

As an emergency fix, I copied over solarized.js and made it as the default theme for JSONTree if its theme prop is missing. This way, users don't have to set the themes themselves for most use cases.

I chose Solarized (even though it's not the default for redux-devtools) because I think most people will use JSONTree standalone on a white background (it's also the default browser background color), and I found that Solarized is most legible for white backgrounds.

I think the longer term solution would be to maybe pull out redux-devtools's themes directory into its own package and require it on both LogMonitor and react-json-tree. What do you think?

Here's the commit for adding a default theme. The screenshot is below (this is also on the README of react-json-tree.)

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Finally, I also added an example for JSONTree.

[gaearon]

Awesome job.

[chibicode]

@gaearon thanks!