Border custom colors

New border colors not used by default.

Black

Indigo

Orange

Pink

Purple

Teal

<!-- Source -->
<div class="border-black"></div>
<div class="border-indigo"></div>
<div class="border-orange"></div>
<div class="border-pink"></div>
<div class="border-purple"></div>
<div class="border-teal"></div>