Merge pull request #22 from oroulet/master

add simple test for events
- automatically handle boost_python library name on fedora
- automatically handle python version in test_highlevel Condition.wait()
- misc. cleanup
- Variant workaround for python-3
Merge pull request #25 from mdcb-gmt/master

python-3 fixes
handle string as argument to get_node
Merge branch 'master' of https://github.com/FreeOpcUa/opcua-python