Start stying barclamps menu

 * Also removes much of old sass styles
Style barclamp menu
Merge branch 'release/pebbles/master-bootstrap-ui' of https://github.com/kwwii/barclamp-crowbar into release/pebbles/master-bootstrap-ui

* 'release/pebbles/master-bootstrap-ui' of https://github.com/kwwii/barclamp-crowbar:
  Remove link to Online help
  Use placeholder text for group field
  Fix pluralization