Redesign profile page and port to Bootstrap

to do:
- [x] profile sidebar
- [x] mention facebox
- [x] /people/guid/contacts
- [x] adapt tests

![people view](https://cloud.githubusercontent.com/assets/3798614/4350071/9f7dcd6e-41d4-11e4-8ac8-316e5c1fd3b5.png)
Don't copy code like that (the same method is in PeopleController). Let's try to find a proper home for it. Maybe `Contact`

```ruby
class Contact
  def self.contact_contacts_for(user, person)
    return none unless user

    if person == user.person
      user.contact_people
    else
      contact = user.contact_for(person)
      contact.try(:contacts) || none
    end
  end
end

@contact_contacts = Contact.contact_contacts_for(current_user, @person)
```