[tox] Drop "touch {envdir}/share/cubicweb/cubes/__init__.py" command on py34 env
This was useful when we installed cubicweb in "develop" mode
but we do not do this anymore.
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)
embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js