Fix LICENSE link
Add configurable external links to top navigation. Resolves #9
Add modified page date to sidebar if available. Solves most of #8
Adjust margin/padding for .entry-meta on small viewports
Merge branch 'feature/modified-date' into develop
Add responsive nav styles when Javascript is disabled
Merge branch 'hotfix/nav-cleanup'
Hide .entry-date on small viewports
Merge branch 'hotfix/entry-date'
Merge remote-tracking branch 'upstream/master'