Merge pull request #1299 from noesya/breadcrumbs

app/models/communication/website/page.rb

app/models/concerns/with_tree.rb

app/views/admin/application/static/_breadcrumbs.html.erb

...dmin/communication/websites/agenda/events/static.html.erb

app/views/admin/communication/websites/pages/static.html.erb

app/views/admin/communication/websites/posts/static.html.erb

app/views/admin/university/organizations/static.html.erb

...ws/admin/university/people/administrators/static.html.erb

app/views/admin/university/people/authors/static.html.erb

...views/admin/university/people/researchers/static.html.erb

app/views/admin/university/people/static.html.erb

app/views/admin/university/people/teachers/static.html.erb