fix new conference links

app/views/layouts/_admin_sidebar.html.haml

@@ -16,7 +16,7 @@
               %span.fa.fa-cog
               Manage
               = conference.short_title
-      - if (current_user.is_admin) || (current_user.has_role? :organizer, :any)
+      - if can? :new, Conference.new
         %li
           = link_to(new_admin_conference_path) do
             %span.fa.fa-plus

app/views/layouts/_admin_sidebar_index.html.haml

@@ -16,7 +16,7 @@
               %span.fa.fa-cog
               Manage
               = conference.short_title
-      - if can? :create, Conference
+      - if can? :new, Conference.new
         %li
           = link_to(new_admin_conference_path) do
             %span.fa.fa-plus

app/views/layouts/_user_menu.html.haml

@@ -28,10 +28,10 @@
         = link_to(admin_conferences_path()) do
           %span.fa.fa-home
           Administration
-      - if can? :create, Conference
+      - if can? :new, Conference.new
         =link_to(new_admin_conference_path) do
           %span.fa.fa-plus
-          Create Conference
+          New Conference
     -if @conference and @conference.id and can? :show, @conference
       %li
         = link_to(admin_conference_path(@conference.short_title)) do