Revert "travis use jruby-19mode"
Revert "travis use jruby-19mode"

This reverts commit 61c54ca500d7cf791398813359256653bbc9924e.

fabn/rack-tracker,stackbuilders/rack-tracker,stackbuilders/rack-tracker,railslove/rack-tracker,ekorneeff/rack-tracker,ekorneeff/rack-tracker,fabn/rack-tracker,railslove/rack-tracker