updated changelog for 4.2.3
bumped version to 4.2.3
Declares t_top variable before it's used on window resize.
Update interchange to support absolute urls.
Merge branch 'master' of github.com:zurb/foundation
Fix typo in interchange.
Merge pull request #2661 from tklun/master

Fixes 't_top' is undefined error in foundation.topbar.js on window resize.
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`.