fix issue215 - refactor test_python.py into multiple files:

- python/collect.py cotaining the core collection nodes
- python/fixture.py containing funcargs/fixture code
- python/metafunc.py generate_tests and metafunc usage
- python/raises.py the pytest.raises implementation

tox.ini

@@ -96,7 +96,7 @@ plugins=pytester
 #--pyargs --doctest-modules --ignore=.tox
 addopts= -rxs
 rsyncdirs=tox.ini pytest.py _pytest testing
-python_files=test_*.py *_test.py
+python_files=test_*.py *_test.py testing/*/*.py
 python_classes=Test Acceptance
 python_functions=test
 pep8ignore = E401 E225 E261 E128 E124 E302