add maven batch mode

4 jobs for master in 3 minutes and 59 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #1594
django

00:00:23

99.0%
passed #1595
selenium-test

00:00:57

 
  Staging
passed #1596
heroku-staging

00:01:18

 
  Production
passed #1597
heroku-production

00:01:19