Rename 'ConferenceController' to 'ConferencesController', and 'ProposalController' to 'ProposalsController'

app/views/conferences/index.html.haml

@@ -0,0 +1,31 @@
+.container
+  .row
+    .col-md-12
+      .page-header
+        %h2 Upcoming Conferences
+  - @current.each do |conference|
+    = render partial: 'conference_details', locals: { conference: conference }
+  -if @antiquated and @antiquated.any?
+    .row
+      .col-md-12
+        %p.text-right
+          %button{ type: 'button', class: 'btn btn-link btn-sm', 'data-toggle' => 'collapse', 'data-target' => '#antiquated', 'aria-expanded' => 'true', 'aria-controls' => 'antiquated'}
+            Older conferences
+            %span.notranslate
+              = "(#{@antiquated.count})"
+            %i.fa.fa-chevron-right
+            %i.fa.fa-chevron-down{ style: 'display: none' }
+    #antiquated.collapse
+      - @antiquated.each do |conference|
+        = render partial: 'conference_details', locals: { conference: conference}
+
+-content_for :script_body do
+  :javascript
+    $('#antiquated').on('hidden.bs.collapse', function () {
+      $( ".fa-chevron-down" ).hide();
+      $( ".fa-chevron-right" ).show();
+    })
+    $('#antiquated').on('shown.bs.collapse', function () {
+      $( ".fa-chevron-down" ).show();
+      $( ".fa-chevron-right" ).hide();
+    })