Styles for author info in footer.
Reorients the borders.
Adds separate mixin for mega bleeding.

Applies to blog archive section.
Returns fullbackground mixin.
Adds background image as a parameter to fullbackground mixin.
Genericize custom pre_get_posts.

Add checks for both people and research post types.
Adds gridlist mixin, styles research archive page.

Removes styles for people list, since it was ugly anyway.
Another gutter/column tweak.