[pagerduty] by default, only ack the incidents assigned to you

src/scripts/pagerduty.coffee

@@ -143,6 +143,9 @@ module.exports = (robot) ->
 
   robot.respond /(pager|major)( me)? ack(nowledge)?$/i, (msg) ->
     pagerDutyIncidents msg, 'triggered,acknwowledged', (incidents) ->
+      email  = msg.message.user.pagerdutyEmail || msg.message.user.email_address
+      incidents = incidentsForEmail(incidents, email)
+
       incidentNumbers = (incident.incident_number for incident in incidents)
       if incidentNumbers.length < 1
         msg.send "Nothing to acknowledge"
@@ -428,6 +431,10 @@ module.exports = (robot) ->
     else
       '(???)'
 
+  incidentsForEmail = (incidents, user_email) ->
+    incidents.filter (incident) ->
+      getUserForIncident(incident) == user_email
+
   generateIncidentString = (incident, hookType) ->
     console.log "hookType is " + hookType
     assigned_user   = getUserForIncident(incident)