Roles into their own controller. Rework interface. Add flash messages to ajax calls. Add description to roles. Possible to edit roles in use.

app/views/admin/roles/_form.html.haml

@@ -0,0 +1,15 @@
+.row
+  .col-md-12
+    .page-header
+      %h2
+        Role
+        = @role.name.titleize
+      .text-muted
+        = @role.description
+
+= semantic_form_for @role, url: admin_conference_role_path(@conference.short_title, @role.name) do |f|
+  .row
+    .col-md-5
+      = f.input :description
+
+      = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }