Rename tests/util.py to tests/test_util.py so that nose will pick up on it.

Signed-off-by: David Black <dblack@atlassian.com>
require nose for testing and run the tests with it.

Signed-off-by: David Black <dblack@atlassian.com>
style fix up in setup.py.

Signed-off-by: David Black <dblack@atlassian.com>