Wipe wall notes feature

CHANGELOG

app/assets/javascripts/dispatcher.js.coffee

app/assets/javascripts/wall.js.coffee

app/assets/stylesheets/sections/wall.scss

app/controllers/projects/walls_controller.rb

app/helpers/events_helper.rb

app/helpers/projects_helper.rb

app/helpers/search_helper.rb

app/mailers/emails/notes.rb

app/models/event.rb

app/models/note.rb

app/models/project.rb

app/observers/note_observer.rb

app/services/notification_service.rb

app/services/projects/create_service.rb

app/views/layouts/nav/_project.html.haml

app/views/notify/note_wall_email.html.haml

app/views/notify/note_wall_email.text.erb

app/views/projects/edit.html.haml

app/views/projects/walls/show.html.haml