button: focus on click, refocus on click to itself
Fix menu-item bemhtml
Merge pull request #367 from bem/issues/366@v2

Fix menu-item bemhtml
add spec for refocus
add spec for focus on click
Merge pull request #368 from bem/issues/365@v2

button: focus on click, refocus on click to itself (close #365)
menu: refactoring (close #363)

  * get rid of `menu__group_has-title` modifier
  * menu-item_checked: use `background` instead of `::before`
menu-item: theme inherit (bh templates)
menu: TODOs + examples
menu: links must inherit `disabled` mod