Revert "Travis: switch to jruby-9k"
Revert "Travis: switch to jruby-9k"

This reverts commit a7d3ed2c0b528f63a1036019a589cd7ad2059329.

gollum/gollum-lib,rgroux/gollum-lib,repotag/gollum-lib,rgroux/gollum-lib,gollum/gollum-lib,repotag/gollum-lib