http://gotwarlost.github.io/istanbul/

gotwarlost/istanbul#44 (comment)

https://coveralls.io

Add directory to:
- .gitignore
- .npmignore

Setup Istanbul and Coveralls for coverage reporting

Update README with Travis and Coveralls badges

Display npm package details:
- https://nodei.co

Display npm version:
- http://shields.io

Display npm dependencies status:
- https://david-dm.org

Misc: https://yanni4night.github.io/badge.html

Fix typo and add more badges to README

The error came from the fact that `props.children` would always
be at minimum an empty array `[]`.

This causes the following error:
```js
ReactDOMServer.renderToString(
    Parser('<img />')
);
// Invariant Violation: img is a void element tag and must neither
// have `children` nor use `dangerouslySetInnerHTML`.
```

The fix was to make `props.children` equal to `null` unless
there were actually more DOM nodes inside the array.

Add tests to confirm that void HTML element tags no longer throws
an error.

`render` is an alias for `ReactDOMServer.renderToStaticMarkup`

Update `render` function to check that the first argument is a
valid React element; otherwise, throw an error.

The `replace` method now has 2 parameters:
1. domNode - The object describing the DOM node.
2. key     - The array index.

The `key` parameter was added because if the element had siblings,
then the replaced React element should have a unique "key" prop
or else React will display a warning:

> Warning: Each child in an array or iterator should have a
> unique "key" prop. See https://fb.me/react-warning-keys for
> more information.

Updated the mock data for complex html and used the `key` parameter
to fix a test.

Add new parameter `key` and update examples.

Fix void element bug and add `key` parameter to `replace` method

- Fix void element bug (#14)
  - Void elements like <img> should not have any children
    (even an empty array `[]` counts as children)
- Pass `key` to the `replace` method as the second parameter
  - Prevent React "key" warning
- Update tests, mocks, and helpers
- Update README with update on `replace` method