Revert "Travis-CI has fixed the Ruby 1.9.2 in the VMs. Readding back to the .travis.yml testing config."
Revert "Travis-CI has fixed the Ruby 1.9.2 in the VMs. Readding back to the .travis.yml testing config."

This reverts commit 3fe0bd6228fd46453d1b2ab042f8eea51a2199f6.

NOTE: Travis is *still* failing with 1.9.2, even though all tests and rake
commands pass in an identical test environment to Travis VMs, locally.
Reverting until Travis 1.9.2 is fixed.

ddd/dtf-rvm,dtf-gems/dtf-rvm,ddd/dtf-skeleton,dtf-gems/dtf-skeleton,dtf-gems/dtf-skeleton,dtf-gems/dtf-rvm,ddd/dtf-skeleton,ddd/dtf-rvm