Update _grid.scss

Author: scottwakefield

src/sass/components/_grid.scss

@@ -8,7 +8,7 @@
   margin-left: -($grid-gutter / 2);
 }
 
-[class*='col-'] {
+[class^='col-'] {
   float: left;
   width: 100%;
   padding-right: ($grid-gutter / 2);