Secondary nav: no <hr>/<span> allowed directly under <ul>
Put navigation styles into own sass file
Sassified and cleand up navigation styles
Split into _nav-pimary.scss and _nav-secondary.scss
Refactored/rewrite of navigation style (manly the secondary one)
Sorry for the big commit, but as it is more a rewrite as refactoring...
Some minor issues still in there
delete generated css
add generated css
Merge pull request #1579 from rarila/sidebar

 Refactoring of navigation (mainly the secondary one)