title: Devise invitable show inviter name or email
body: <p>I want to be able to show the user that sent out the invitation rather than just my domain when sending out a devise invitation but haven't been able to find any documentation on this. </p>
  
  <p>The two places where I need to show this name are in the invitation email- </p>
  
  <p>(in place of 'Someone')</p>
  
  <pre><code>&lt;p&gt;Hello &lt;%= @resource.email %&gt;!&lt;/p&gt;
  
  &lt;p&gt;Someone has invited you to &lt;%= root_url %&gt;, you can accept it through the link below.&lt;/p&gt;
  
  &lt;p&gt;&lt;%= link_to 'Accept invitation', accept_invitation_url(@resource, :invitation_token =&gt; @resource.invitation_token) %&gt;&lt;/p&gt;
  
  &lt;p&gt;If you don't want to accept the invitation, please ignore this email.&lt;br /&gt;
  Your account won't be created until you access the link above and set your password.&lt;/p&gt;
  </code></pre>
  
  <p>and the set password page. </p>
  
  <pre><code>&lt;h4&gt;You're seeing this page because someone has invited you to the site&lt;/h4&gt;
  &lt;%= simple_form_for resource, :as =&gt; resource_name, :url =&gt; invitation_path(resource_name), :html =&gt; { :method =&gt; :put } do |f| %&gt;
    &lt;%= devise_error_messages! %&gt;
    &lt;%= f.hidden_field :invitation_token %&gt;
  &lt;div class="row"&gt;  
    &lt;div class="signup_well span3 offset1"&gt;
      &lt;legend&gt;&lt;%= t 'devise.invitations.edit.header' %&gt;&lt;/legend&gt;
      &lt;%= f.input :password %&gt;
      &lt;%= f.input :password_confirmation %&gt;
      &lt;%= hidden_field_tag :token_key, resource.invitation_token %&gt;
      &lt;%= f.submit t("devise.invitations.edit.submit_button") %&gt;
    &lt;% end %&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I may over looking any documentation on the best approach to do this. Your help saves a lot of frustration. Thank you. </p>