Created a nifty customizer using React.

[josephgeis]

I also changed the <textarea>s to styled <pre>s. Because the <textarea>s weren't going down well with React. I needed some practice with React, so I decided to make a customizer that spits out the code people need to insert for their project. The code for the customizer can be found in src/ and the Webpack-compiled code is in dist/. Webpack compiles it as a development build so that it can be inspected in the browser with the React tools.

[josephgeis]

I’m interested in your input on my idea.

[ahuglajbclajep]

This PR probably resolves #42, but the output contains code from the React itself, which is undesirable.