New class to hide li:before on any descendant

[milesdelliott]

NC State Bootstrap uses a :before pseudo-element to add a little chevron to replace the list style image, this makes it hard to remove with list-style-type: none.

We have the existing class n_before-none but that only works when applied directly to the <li> or the <ul> elements.

Should we create a class, maybe n_before-none--force that will remove the :before psuedo-element from any descendant <li> element?