Refs #2275: responsive header for tablets and smartphones
Refs #2275: responsive global menu level 1 for tablets and smartphones
Refs #2275: visible breadcrumbs for tablets and smartphones
Refs #2275: position for logo + hamburger menu @480px resolutions
Refs #2275: arrange footer menu on tablets and smartphones
Merge pull request #146 from sandriu/master

various fixes for tablets and smartphones