implement user creation by admin

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

@@ -1,25 +1,28 @@
 = semantic_form_for [:admin, @user] do |f|
   = f.inputs 'Basic Information' do
-    .pull-right
-      %b
-        Confirmed?
-      - if can? :toggle_confirmation, @user
-        = check_box_tag @user.id, @user.id, @user.confirmed?, 
-          method: :patch, 
-          url: "/admin/users/#{@user.id}/toggle_confirmation?user[to_confirm]=", 
-          class: 'switch-checkbox', 
-          readonly: false,
-          data: { size: 'small', on_color: 'success', off_color: 'warning', on_text: 'Yes', off_text: 'No' } 
-      - else
-        = check_box_tag @user.id, @user.id, @user.confirmed?, 
-          method: :patch, 
-          url: "/admin/users/#{@user.id}/toggle_confirmation?user[to_confirm]=", 
-          class: 'switch-checkbox', 
-          readonly: true,
-          data: { size: 'small', on_color: 'success', off_color: 'warning', on_text: 'Yes', off_text: 'No' } 
+    - unless @user.new_record?
+      .pull-right
+        %b
+          Confirmed?
+        - if can? :toggle_confirmation, @user
+          = check_box_tag @user.id, @user.id, @user.confirmed?,
+            method: :patch,
+            url: "/admin/users/#{@user.id}/toggle_confirmation?user[to_confirm]=",
+            class: 'switch-checkbox',
+            readonly: false,
+            data: { size: 'small', on_color: 'success', off_color: 'warning', on_text: 'Yes', off_text: 'No' }
+        - else
+          = check_box_tag @user.id, @user.id, @user.confirmed?,
+            method: :patch,
+            url: "/admin/users/#{@user.id}/toggle_confirmation?user[to_confirm]=",
+            class: 'switch-checkbox',
+            readonly: true,
+            data: { size: 'small', on_color: 'success', off_color: 'warning', on_text: 'Yes', off_text: 'No' }
     = f.input :is_admin, hint: 'An admin can create a new conference, manage users and make other users admins.'
     = f.input :name, as: :string
+    = f.input :username, :as => :string if @user.new_record?
     = f.input :email
+    = f.input :password if @user.new_record?
     = f.input :affiliation, as: :string
     = f.input :biography, input_html: { rows: 10, data: { provide: 'markdown-editable' } },
       hint: markdown_hint

app/views/admin/users/index.html.haml

@@ -1,10 +1,13 @@
 .row
   .col-md-12
     .page-header
-      %h2
+      %h1
         Users
         - if @users
           = "(#{@users.length})"
+        - if can? :create, User
+          .pull-right
+            =link_to 'Add User', new_admin_user_path, :class => 'button btn btn-default btn-info'
 .row
   .col-md-12.table-responsive
     %table.table.table-striped.table-bordered.table-hover.datatable