py.test/pylib 1.3.4: fixes and new native traceback option

pylib/py.test 1.3.4 is a minor maintenance release mostly containing bug fixes and a new "--tb=native" traceback option to show "normal" Python standard tracebacks instead of the py.test enhanced tracebacks. See below for more change info and http://pytest.org for more general information on features and configuration of the testing tool.

Thanks to the issue reporters and generally to Ronny Pfannschmidt for help.

cheers, holger krekel

Changes between 1.3.3 and 1.3.4