Documented multiline table header quirkiness, resolves #54

docs/table.html

@@ -150,6 +150,7 @@
               <ul>
                 <li>Tables are responsive by default and will change to a card-like view below a certain screen width. If you'd rather not make them responsive, check the last section on this page.</li>
                 <li>Specifying the <code>data-label</code> attribute is essential for the responsive version of a table to display properly. You can, however, use a value different from the column's name. Make sure it does not confuse your users, though.</li>
+				<li>We strongly suggest you avoid adding multiple rows in your <code>&lt;thead&gt;</code> element, as it could cause problems with accessibility. However, if you absolutely must, you might want to check <a href="http://codepen.io/chalarangelo/pen/VPqWQE">this codepen</a> for an idea on how to deal with irregular border styling.</li>
               </ul><hr>
               <div class="row">
                 <div class="col-sm-12 col-md-6">

docs/v2/DEVLOG.md

@@ -860,3 +860,4 @@
 - Documented `tooltip`. No *dos* and *don'ts* seem to be required, as the use cases are really really simple.
 - Added accessibility guidelines for using `role="button"` in `navigation`.
 - Added `sticky` documentation in `navigation`. No *dos* and *dont's* either, I'm afraid, can't find any troublesome things with this.
+- Added a quick fix for `table`s' irregular styling of mutliline headers. Resolves #54.