Renders the lists in seantis.people table and detail view denser.

I've been wondering, would it make sense to have a couple of helper classes to style common elements? For example. A .tag class could activate the tag from the mixins. A 'dense' class could be used below, instead of a very specific style.

So instead of this pull request, I would just render my ul elements like this:

    <ul class="dense"></ul>

Relying on something like this:

    .dense {
        margin-bottom: 0;
    }

What do you think @ninfaj?