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

spec/models/role_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+describe Role do
+  let(:conference) { create(:conference) }
+  let!(:organizer_role) { Role.find_by(name: 'organizer', resource: conference) }
+  let!(:cfp_role) { Role.find_by(name: 'cfp', resource: conference) }
+  let!(:organizer) { create(:user, role_ids: organizer_role.id) }
+
+  it 'get_users' do
+    expect(organizer_role.users).to include organizer
+    expect(organizer_role.users.count).to eq 1
+    expect(cfp_role.users).to eq []
+  end
+end