Use grid classes or mixins on .dl-horizontal, update docs to include it, removes auto truncate and makes .text-overflow mixin into a .text-truncate class and mixin combo for better granularity

scss/mixins/_text-truncate.scss

@@ -1,7 +1,7 @@
-// Text overflow
+// Text truncate
 // Requires inline-block or block for proper styling
 
-@mixin text-overflow() {
+@mixin text-truncate() {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;