Added margin-bottom to top-bar when nested in .contain-to-grid
Add some simple styling to the .parent-link

Add some simple styling to the `.parent-link` that is generated when you are looking at a drop down menu in mobile state.
I use the $topbar-link-weight that by default is set to `bold`.
Fix to ensure that cached images are available before use
Pimping up emCalc
Updated the scss files to use the new updated emCalc()
Updated documentation
Toggle the display of the parent menu link in the mobile topbar perspective
Use $global-radius as the default setting for side-radius()

Use $global-radius as the default setting for side-radius().
This way you can:
```scss
div {
  @include side-radius(bottom);
}
```
Instead of:
```scss
div {
  @include side-radius(bottom, $global-radius);
}
```
Document threshold setting
Modified to hide tip but keep in layout until after the scroll logic calculations to prevent bouncing back to the top in the case of a short document where the tip content itself made the document larger.
Fixed deep linking for nested content and improved selected hash checking to ensure a correct match
Fixed height and padding for lists with the .current-class applied and no anchor as a child.
Updating new footer
New footer & Offcanvas
Made slim template cleaner and more efficient
Improve contributing documentation.
close dropdown on document click
Documentation fix, wrong JS reference
move offcanvas and footer code into sprockets manifest files for docs
ensure images are moved into public/assets directory for documentation