Change footer.
Change site name and enable multiple authors.

To sign up as an author, put your information in `_config.yaml`:

    authors:
        your_cool_name:
            other_meta_infos: come_here

And don't forget to add your name in your post:

    ---
    layout: post
    title: "A cool article"
    author: your_cool_name
    ---
Merge pull request #1 from bcho/gh-pages

Enable multiple authors support.