tests: execute run-tests.sh instead of source

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
tests: skip loader test on Python-3.4.1

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
version: post-release version bump

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>