Fixed minor issues caused by the move to py3k (#2310)
Fixed minor issues caused by the move to py3k (#2310)

* .travis.yml: Removed libopenmpi

* .travis.yml: Removed unecessary echo

* .travis.yml: Removed apt-get update (not used)


Former-commit-id: 9101db2ba8d04409abe356b2cb5fe46b8fcdd95b
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox