Rename dist filenames and add webpack to `.npmignore`

- Create directory `./examples/`
- Create HTML file in `./examples/` with a working example of
  loading the parser with a script tag

Create an HTML file in `./examples/ that loads the parser and
React with Require.js

Make explanations/examples clearer, trim fat, and add hyperlinks.

Also add examples link.

Separate the examples into their own code blocks. Rewrite in ES6
syntax for cleanliness and readability.

Make instructions clearer; simplifying examples by removing
unnecessary parts and rewriting them with ES6.

Trim the fat and keep the example super concise and readable.
Refactor example to ES6 and JSX.

Add examples

Tidy README instructions and examples

- Update build (#25):
  - Change filenames in `dist/` to `html-react-parser`
- Create examples (#26):
  - Examples found in the directory `examples/`
  - Add `script-tag.html`, which is an example of loading the
    parser via the CDN
  - Add `requirejs.html`, which is an example of loading the
    parser via Require.js
- Update `README.md` (#27):
  - Reword and tidy description and instructions
  - Update installation with CDN link
  - Refactor and tidy examples using ES6 and JSX
- Update `.npmignore`:
  - Add `webpack.config.js`
  - Add `examples`