WIP
Merge branch 'master' into logbook

* master:
  Format customer name
  Align placeholder with event panels
  Cleanup views
  Switch address and certification tabs
  Redesign customer overview incl. hotel name
  Fix customer search spec
  Double-click in calendar to switch to event
  Remove fake DM from event panel
  Make customer email optional

Conflicts:
	db/schema.rb
Flash messages, logbook
Merge branch 'logbook'

* logbook:
  Flash messages, logbook
  WIP