Revert "upgrade to new travis infrastructure (what could possibly go wrong)"
Revert "upgrade to new travis infrastructure (what could possibly go wrong)"

This reverts commit d26dbea4a99c003b86fce2a751e272ac67828315.

tijoseymathew/mlr,vinaywv/mlr,vinaywv/mlr,vinaywv/mlr,tijoseymathew/mlr,tijoseymathew/mlr