travis: test v0.12, don't test v0.6 and v0.11
travis: test v0.12, don't test v0.6 and v0.11

santigimeno/node-time,santigimeno/node-time,santigimeno/node-time,TooTallNate/node-time,TooTallNate/node-time,TooTallNate/node-time