anchor.diff:                      <tr>
                           <td style="padding: 20px 0 0;">
                               <center>
  -                                <a href="<%= Rails.application.config.action_mailer.default_url_options || "" %>?ref=<%= @user.referral_code %>" style="font-family: 'Times', serif; font-size: 14px; letter-spacing: 0.05em; color: #6c6c6c; text-decoration: none" target="_blank"><%= Rails.application.config.action_mailer.default_url_options || "" %>?ref=<%= @user.referral_code %></a>
  +                                <a href="<%= Rails.application.config.action_mailer.default_url_options[:host] || "" %>?ref=<%= @user.referral_code %>" style="font-family: 'Times', serif; font-size: 14px; letter-spacing: 0.05em; color: #6c6c6c; text-decoration: none" target="_blank"><%= Rails.application.config.action_mailer.default_url_options[:host] || "" %>?ref=<%= @user.referral_code %></a>
                               </center>
                           </td>
                       </tr>
  
positive.code:                             <table style="margin: 0 auto; padding: 0; width: 200px; font-family: 'Helvetica Neue-Light', 'Helvetica Neue Light', 'Helvetica Neue', HelveticaNeue, Helvetica, Arial, sans-serif; font-size: 0; color: #CCC; font-weight: normal; background: white; text-align: center;" width='200' cellspacing='0' cellpadding='0' align="center" bgcolor="#FFFFFF">
                                  <tr>
                                      <td width="80" align="right">
                                          <a href="http://www.facebook.com/sharer/sharer.php?u=<%= CGI::escape(Rails.application.config.action_mailer.default_url_options || "") %>?ref=<%= CGI::escape(@user.referral_code) %>&title=Harrys" style="outline: 0; border: 0;" target="_blank">
                                              <img src="<%= Rails.application.config.action_mailer.default_url_options %>/assets/facebook.jpg" alt="Share on Facebook" style="display: block; margin: 0; padding: 0; border: 0;">
                                          </a>
                                      </td>
                                      <td width="20"></td>
                                      <td width="80">
                                          <a href="http://twitter.com/share?url=<%= CGI::escape(Rails.application.config.action_mailer.default_url_options || "") %>?ref=<%= CGI::escape(@user.referral_code) %>&text=<%= CGI::escape(@twitter_message) %>" style="outline: 0; border: 0;" target="_blank">
                                              <img src="<%= Rails.application.config.action_mailer.default_url_options %>/assets/twitter.jpg" alt="Share on Twitter" style="display: block; margin: 0; padding: 0; border: 0;">
                                          </a>
                                      </td>
                                  </tr>
  
negative.code:                     <tr>
                          <td style="padding: 27px 0 27px;">
                              <center>
                                  <img src="<%= Rails.application.config.action_mailer.default_url_options[:host] %>/assets/nursegrid_logo_blue.png" alt="NurseGrid" style="display: block; margin: 0 auto; padding: 0; border: 0;">
                              </center>
                          </td>
                      </tr>
  