Whoa! Jekyll, Foundation 6, HTML5 boilerplate and github pages!
I've combined my locally installed libsass/gulp version of foundation 6, html5 boilder plate, and Jekyll to be used for github pages! See Jekyll's documentation, the foundation documentations, and GitHub pages help pages.
You should probably update the _config.yml file, and edit scss/_setting.scss file. As well as scss/_custom.scss, where most the overrides are happening.
Updated to support Foundation 6.4 with its awesome XY-Grid and Flexbox Utilities, creating complicated layouts just got a lot simpler. If you are upgrading from old layouts, replace