Clean up behavior when no comment provider specified.

[emceeaich]

If a site does not specify either a disqus or Facebook comment provider, individual posts are still rendered with an empty comment box. This is fixed in this pull request.

A site that specified 'en' as language would still use the 'tw' language local files. Add a en.yml locale file.

Update documentation in the readme.

In the longer term it would be good to get per-site configurations out of the theme and moved into to site/_config.yml

[emceeaich]

Pinging the project maintainers, is this theme still being supported?

[Xuanwo]

Supported by society.