Add email link to promo traffic help page

r2/example.ini

@@ -313,6 +313,7 @@ payment_domain = https://pay.reddit.local/
 ad_domain = http://reddit.local
 allowed_pay_countries = United States, United Kingdom, Canada
 sponsors =
+selfserve_support_email = selfservesupport@mydomain.com 
 
 # authorize.net credentials (blank authorizenetapi to disable)
 authorizenetapi =

r2/r2/templates/promotraffichelp.html

@@ -21,6 +21,7 @@
 ###############################################################################
 
 <%!
+    from pylons import g
     from r2.lib.strings import strings
     from r2.lib.filters import safemarkdown
     from r2.lib.template_helpers import format_number, js_timestamp, html_datetime
@@ -36,4 +37,8 @@
       ${_("Campaigns created before Sept 12, 2012 will not be included in " +
           "these totals.")}
     </p>
+    <p>
+      ${_("Questions? Email self serve support:")}
+      <a href="mailto:${g.selfserve_support_email}">${g.selfserve_support_email}</a>
+    </p>
 </div>