Sort available_services_names array alphabetically

app/models/service.rb

@@ -122,25 +122,25 @@ class Service < ActiveRecord::Base
   def self.available_services_names
     %w(
-      gitlab_ci
-      campfire
-      hipchat
-      pivotaltracker
-      flowdock
-      assembla
       asana
+      assembla
+      bamboo
+      buildbox
+      campfire
+      custom_issue_tracker
       emails_on_push
+      external_wiki
+      flowdock
       gemnasium
-      slack
-      pushover
-      buildbox
-      bamboo
-      teamcity
+      gitlab_ci
+      hipchat
+      irker
       jira
+      pivotaltracker
+      pushover
       redmine
-      custom_issue_tracker
-      irker
-      external_wiki
+      slack
+      teamcity
     )
   end