Sticky Top Bar

Using the top-bar with the class .sticky, it can be placed anywhere in
the document flow, for example, under a heading (when used with
.contain-to-grid). Once the page is scrolled to where the navigation
is, the class .fixed is added and it remains at the top of the page.
When scrolling back up, the class .fixed is removed once it hits it's
original position.
Removed erroneous margin from .sticky
Added overflow

Added overflow: hidden;
Fix for sticky nav bar when viewport width is less than max grid size
Merge pull request #1354 from jordanmerrick/Sticky-Top-Bar

Sticky Top Bar