Fix `mesh-[1-12]` not being handled as columns

Further details in each commit. Some commits are duplicated since git got crazy with the files being moved all around with gulp.

__Note__: the diff is waaaay too dirty since we are committing `bower_components` to the repo. To avoid that may be a good idea to just include the dist versions of each dependency, simplify the demo to avoid dependencies, or just put it some place else.