add views for organization admin role

app/views/admin/organizations/show_org_admins.haml

@@ -0,0 +1,24 @@
+.row
+  .col-md-12
+    .page-header
+      %h2
+        Organization admins for #{@organization.name}
+      .text-muted
+        = @role.description
+
+.row.col-md-3
+  - if ( can? :assign_org_admins, @organization )
+    = semantic_form_for :user,
+      url: assign_org_admins_admin_organization_path(@organization,
+      @role.name), method: :post do |u|
+
+      = u.label 'Add user by email: '
+      .input-group
+        = u.input :email, label: false, placeholder: "User's email"
+        .input-group-btn
+          = u.submit 'Add', id: 'user-add', class: 'btn btn-primary'
+
+.row
+  .col-md-12
+    = render partial: 'users_with_org_admin_role',
+      locals: { users: @users, organization: @organization, role: @role }