Fix rubocop warnings and User index bug

app/views/layouts/_user_menu.html.haml

@@ -37,7 +37,7 @@
           %span.fa.fa-cog
           Manage
           = @conference.short_title
-- if can? :index, User
+- if can? :manage, User.new
   %li
     = link_to(admin_users_path) do
       %span.fa.fa-user

spec/features/proposal_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 feature Event do
-  let!(:conference) { create(:conference, call_for_paper: create(:call_for_paper) ) }
+  let!(:conference) { create(:conference, call_for_paper: create(:call_for_paper)) }
   let!(:organizer_role) { create(:organizer_role, resource: conference) }
   let!(:organizer) { create(:user, email: 'admin@example.com', role_ids: [organizer_role.id]) }
   let!(:participant) { create(:user) }

spec/models/conference_spec.rb

@@ -516,7 +516,7 @@ describe Conference do
 
     describe '#event_type_distribution' do
       it 'calculates correct for different event types' do
-        blah = create(:event, conference: subject, event_type: @workshop)
+        create(:event, conference: subject, event_type: @workshop)
         create(:event, conference: subject, event_type: @workshop)
         create(:event, conference: subject, event_type: @lecture)
         result = {}