[WIP] Travis: update matrix to build with python 3.4#555

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cchampet wants to merge 5 commits intotuttleofx:developfrom

cchampet:travis_upToPython3.4

Commits on May 30, 2016

CMake: fixed configure of application if TUTTLE_PYTHON_VERSION is not set
Clement Champetier
committed
Travis: updated matrix to build for python3.4
Clement Champetier
committed
Travis: refactored how to launch tests
Clement Champetier
committed
Travis: updated packages to build Viewer plugin
Clement Champetier
committed
Travis: fixed build of ImageMagick plugin
Clement Champetier
committed