add a testjar stage to travis for PRs
add a testjar stage to travis for PRs

slamdata/slamengine,quasar-analytics/quasar,quasar-analytics/quasar,quasar-analytics/quasar,slamdata/quasar,djspiewak/quasar,slamdata/slamengine,quasar-analytics/quasar,slamdata/slamengine