Nose3

- Fix bug in main() that resulted in incorrect exit status for nosetests
script when tests fail
- Add missing test files to MANIFEST.in
- Miscellaneous pylint cleanups

- Add doctest support
- Add optional code coverage support, using Ned Batchelder's coverage.py;
activate with --coverage switch or NOSE_COVERAGE environment variable
- More informative error message on import error
- Fix bug where module setup could be called twice and teardown skipped
for certain setup method names.
- main() returns success value, does not exit. run_exit() added to support
old behavior; nosetests script now calls nose.run_exit()

- Fix bus error on exit
- Discover tests inside of non-TestCase classes that match testMatch
- Reorganize selftest: now selftest tests the output of a full nose run
- Add test_with_setup.py contributed by Kumar McMillan

- Refactor and correct bugs in discovery and test loading
- Reorganize and expand documentation
- Add -f (run this test file only) switch

- Bugfix release: test files in root of working directory were not being
stripped of file extension before import.

- Change license to LGPL
- Major rework of output capture and assert introspection
- Improve test discovery: now finds tests in packages
- Replace -n switch ('no cwd') with -w switch ('look here')