add natural sorting token for build names

app/models/commit_status.rb

@@ -137,4 +137,10 @@ class CommitStatus < ActiveRecord::Base
       .new(self, current_user)
       .fabricate!
   end
+
+  def natsort_name
+    name.split(/(\d+)/).map do |v|
+      v =~ /\d+/ ? v.to_i : v
+    end
+  end
 end

app/views/projects/stage/_graph.html.haml

 - stage = local_assigns.fetch(:stage)
 - statuses = stage.statuses.latest
-- status_groups = statuses.sort_by(&:name).group_by(&:group_name)
+- status_groups = statuses.sort_by(&:natsort_name).group_by(&:group_name)
 %li.stage-column
   .stage-name
     %a{ name: stage.name }