moved test data files to one location
added test for getting all test file names
added tests for get_abs_path
implemented getting test file names
Use centralize test data files.
Merge pull request #15 from parkin/reorganizeTests

Reorganize test data files to central location.
moved PathItem tests to graphicsItems.tests
fixed author link
dont use multiprocessing on Windows. Just use threading
added file for my_threads tests.
Merge branch 'windowsProcessFail' of https://github.com/parkin/pypore into windowsProcessFail