Update CHANGELOG.md.

[ci skip]
Update README.md.

Use `https` for GitHub links.

[ci skip]
Add maintainers info in package.json.

Remove the redundant AUTHORS file.

[ci skip]
Add AppVeyor for Windows testing.
Merge pull request #144 from XhmikosR/appveyor

Add AppVeyor for Windows testing.
Try uncss from the "phridge" branch.