add mail+pass change option

app/views/users/edit_login.html.erb

@@ -0,0 +1,36 @@
+<%= link_to @user.name, @user %> → Edit Login credentials
+<h1>Edit Login credentials</h1>
+
+
+<%= form_for @user, url: update_login_user_path(@user), method: :put do |f| %>
+  <table>
+    <tbody>
+      <tr>
+        <td>New email</td>
+        <td>
+          <%= f.text_field :email %>
+        </td>
+      </tr>
+      <tr>
+        <td>New password</td>
+        <td>
+          <%= f.password_field :password %>
+        </td>
+      </tr>
+      <tr>
+        <td>Repeat new password</td>
+        <td>
+          <%= f.password_field :password_confirmation %>
+        </td>
+      </tr>
+      <tr>
+        <td>Current password</td>
+        <td>
+          <%= password_field_tag :current_password, nil, disabled: !@user.is?(current_user) %>
+        </td>
+      </tr>
+    </tbody>
+  </table>
+  <p><%= f.submit "Save changes", class: "btn blue left" %></p>
+  <div class="clear"></div>
+<% end %>