ensure activity reports with custom fields work properly.

See http://issues.civicrm.org/jira/browse/CRM-13715
ensure email to contact works when assignee and activity

See http://issues.civicrm.org/jira/browse/CRM-13203
Update Activity.tpl

Remove extraneous comma in line 138 (include for NewContact.tpl)
Merge pull request #2039 from jmcclelland/assignee-email

ensure email is sent when contact is assigned to an activity
Merge pull request #2037 from jmcclelland/reports-with-custom-fields

ensure activity reports with custom fields work properly.