Remove CSS reset that removes focus outline from all elements by default

Oh jeez, idk why this was ever in here, but yeah no, I want to be using
default browser focus outlines unless specifically overridden otherwise.
Will help keyboard navigation a lot! Yikes!!

app/assets/stylesheets/_layout.sass

@@ -16,7 +16,6 @@ caption, tbody, tfoot, thead, tr, th, td
   margin: 0
   padding: 0
   border: 0
-  outline: 0
   font-size: 100%
   vertical-align: baseline
   background: transparent