Add collection to app.views.NotificationDropdown and app.views.Notifications

Changelog.md

app/assets/javascripts/app/app.js

app/assets/javascripts/app/collections/notifications.js

app/assets/javascripts/app/models/notification.js

app/assets/javascripts/app/router.js

app/assets/javascripts/app/views/header_view.js

...ssets/javascripts/app/views/notification_dropdown_view.js

app/assets/javascripts/app/views/notifications_view.js

app/assets/javascripts/helpers/browser_notification.js

app/assets/templates/header_tpl.jst.hbs

app/controllers/notifications_controller.rb

app/views/notifications/index.html.haml

config/locales/javascript/javascript.en.yml

spec/controllers/jasmine_fixtures/notifications_spec.rb

spec/controllers/notifications_controller_spec.rb

...ascripts/app/collections/notifications_collection_spec.js

spec/javascripts/app/models/notification_spec.js

spec/javascripts/app/views/header_view_spec.js

.../javascripts/app/views/notification_dropdown_view_spec.js

spec/javascripts/app/views/notifications_view_spec.js