Make travis build on 1.8.7, 1.9.2, ree, rbx and rbx-2.0
Make travis build on 1.8.7, 1.9.2, ree, rbx and rbx-2.0

szymon-przybyl/forem,frankel/forem,substantial/forem,filiptepper/forem,caffo/forem,caffo/forem,nruth/forem,dmitry-ilyashevich/forem,szymon-przybyl/forem,substantial/forem,dmitry-ilyashevich/forem,frankel/forem,filiptepper/forem,nruth/forem