Use backbone for flash messages

app/helpers/sessions_helper.rb

app/views/conversations/create.js.erb

app/views/layouts/application.html.haml

app/views/photos/_new_profile_photo.haml

app/views/sessions/new.mobile.haml

app/views/tags/update.js.erb

features/support/application_cuke_helpers.rb

spec/javascripts/app/views/aspect_create_view_spec.js

spec/javascripts/app/views/aspect_membership_view_spec.js

spec/javascripts/app/views/comment_stream_view_spec.js

spec/javascripts/app/views/contact_view_spec.js

spec/javascripts/app/views/conversations_view_spec.js

spec/javascripts/app/views/flash_messages_view-spec.js

spec/javascripts/app/views/pod_entry_view_spec.js

spec/javascripts/helpers/SpecHelper.js

spec/javascripts/widgets/flash-messages-spec.js