Added jruby-19mode to allowed failures section, temporarily.
Added jruby-19mode to allowed failures section, temporarily.

* Travis-CI does not have JRuby 1.7.1, currently, in their images.
  This is being added as of this timestamp but is not currently in
  place. This change will be reverted as soon as it is live on Travis.

ddd/dtf,dtf-gems/dtf,dtf-gems/dtf,ddd/dtf