Add at least one alternate stylesheet that uses a non-Bootstrap framework

[hegemonic]

Partly for variety, partly to verify that everything works as expected.

[hegemonic]

A few to consider:

• [ ] Basscss (CSS4)
• [ ] Cardinal (LESS)
• [ ] Concise.CSS (LESS)
• [ ] Gumby Framework (SASS)
• [ ] Kraken (SASS)
• [ ] Materialize (SASS)
• [ ] Primer (SASS)
• [ ] Pure (LESS)
• [ ] Refills (SASS)
• [ ] Skeleton (CSS)
• [ ] Susy (SASS)
• [ ] Titon Toolkit (SASS)
• [ ] UIkit (LESS)