Redesign and UI improvements

In-progress redesign and various UI/UX improvements.
Well, the answer is, it's complicated ;). There is no inherent license for gists. All code (and other creative work) is automatically copyrighted. I think that in some cases, if the work is trivial enough, you can make a fair use argument for copying it without the permission of the author (a license), but normally, you need permission. 

Gists without licenses are frustrating. You can probably infer some author intent based on the fact that they published it in a public place independently, instead of as part of some larger project, but that only goes so far.

Another wrinkle is that this was derived from Foundation which is MIT Licensed, so depending on how the "technique" was "adapted" and how similar the two pieces of code are, this code might be subject to the Foundation license as well.

That said, I took a look at the Foundation version of block grids, and it looks at least superficially different than this code. I think it's ok to say that this isn't covered by the Foundation license, and we can just decide to infer that the author of this gist published it with the intent that other people use it. Probably shaky legal ground, but we can just remove it if asked.