Use “smart quotes” in Markdown files
Add note about concatenating JSON3 together with other modules

Closes #63
README.md: Use U+2026 HORIZONTAL ELLIPSIS
README.md: Update links
Re-generate `index.html`
Use HTTPS links

[ci skip]
Update copyright year. [ci skip]
Tweak the page styles for legibility. [ci skip]
Update contribution guidelines. Closes #55.

[ci skip]
Generate a page for the contribution guidelines.

Clean up `build.js`. [ci skip]
Update the change log to v3.2.6. [ci skip]
Add a project page for the change log. [ci skip]
Link to issues in the generated change log.

[ci skip]
Rename `forEach` to `forOwn`
Use consistent `for`-loop syntax in `walk`
Use consistent `className` assignment in `JSON3.stringify`
Shift `isProperty` and `forOwn` into `if`-block
Rename `undef` to `undefined`
Add `serializeDate` function

Ref. #65
Remove Prototype <= 1.6.1 Support

Closes #66