add supervisord export engine

data/export/supervisord/master.conf.erb

@@ -1,3 +1,9 @@
+<% 
+engine.procfile.entries.each do |process|
+  next if (conc = self.concurrency[process.name]) < 1 
+  1.upto(self.concurrency[process.name]) do |num| 
+    port = engine.port_for(process, num, self.port)
+%>  
 [program:<%= app %>-<%= process.name %>]
 command=<%= process.command %>
 autostart=true
@@ -7,4 +13,8 @@ stdout_logfile=<%= log_root %>/<%=process.name%>-<%=num%>.log
 stderr_logfile=<%= log_root %>/<%=process.name%>-<%=num%>err.log
 user=<%= user %>
 directory=<%= engine.directory %>
-environment=<% engine.environment.each_pair { |var,env| "#{var.upcase}=#{env}" }.join(',') %>
+environment=<% engine.environment.each_pair { |var,env| "#{var.upcase}=#{env}" }.join(',') %>,<%= "PORT=#{port}" %>
+<% 
+  end
+end 
+%>