require uuid for password reset, destroy token after each try

app/views/users/lost_password.html.erb

@@ -5,6 +5,10 @@
 <p>Luckily for you, you can reset your password. Please use the command <code>/gettoken &lt;your email address&gt;</code>, then fill in the form below:</p>
 <%= form_tag reset_password_users_path do |f| %>
   <table>
+    <tr>
+      <td><%= label_tag :ign, "Minecraft name" %></td>
+      <td><%= text_field_tag :ign, nil, placeholder: "Steve", pattern: "[a-zA-Z0-9_]{2,16}", required: true, title: "Your IGN" %></td>
+    </tr>
     <tr>
       <td><%= label_tag :email %></td>
       <td><%= text_field_tag :email, nil, placeholder: "steve@example.com", required: true, pattern: ".+@.+", title: "enter valid email address", "x-moz-errormessage" => "enter valid email address" %></td>