fix race condition when running tests concurrently
Merge pull request #2 from kmaehashi/fix-race

fix race condition when running tests concurrently
Support Python 2.5

- remove b'' notation and use encode method
- remove relpath method
Merge pull request #3 from unnonouno/for-python2.5

Support Python 2.5
Use call function instead of check_call, and the script works on python2.4
Merge pull request #4 from unnonouno/for-2.4

Use call function instead of check_call, and the script works on python2.4