Travis: isct_propseg: install more deps
Travis: isct_propseg: install more deps

Former-commit-id: e22591c2d199acefde556a3f5941193c11d12a67
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox